Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9425d10325faf92…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 21:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5edbf65647489db31f4e71f0597f6c1 SHA-1: f068de978de3244a09db4ad6ee40f6f3aadef6c1 SHA-256: d9425d10325faf92e4a9a42657c94bdf27a3690336c4c4eca679ccd043822a25
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains multiple links to external URLs, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The heuristics indicate the document attempts to trick users into executing commands via clipboard manipulation and suggests the use of password-protected archives, a common tactic to evade gateway security. The presence of these lures strongly suggests an intent to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=how+to+make+a+window+in+java PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7e6b395e9512b23565fdcec058db8448/pusireludoxap.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mudedifuxobujolefiloju.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jupixopivitagozite.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e8148be48---likaboremulagevoxo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/60330585402.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607261df048f2---tulenuguzoke.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f1479d319b9b23e70ba0536022724de/85113907150.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dbc151b604661eba7be1a570446db5b8/47973950220.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5p2k2frmbjqsjhvpv91h9875m0/30718449573.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/pojajagowugikamogefo.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fce35ef84f55f311c0a9c80922c70533/28501158560.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a458a869638---5671506690.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca7765349---51660686383.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/14894088805.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/rofokunewusafonu.pdfIn PDF document text
    • http://seamacros.com/upload/file/jinajumogevapox.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xowotit.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f5520173---bezikeviwojepotimad.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0970c73ff3---70687190980.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a012c8be88e8808ff6a5e26cfbe434e4/rovuvipoxesavog.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f11155c5a---fokegijerugawokukibiruku.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/82902616365.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072969685ad9---xamezakinoxek.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///poduzozogopajudidipukizom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16784 bytes
SHA-256: f5798d4de4a9813725948f9a921632315d3c77b9adbf6b33f42e1c364bfd8a57
font_02_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 10460 bytes
SHA-256: 09070b3f026df3ce1535e3119f063146a624c7c80c8efe03387196e3a8cf08c6

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