Malicious PDF — malware analysis report

Static analysis result for SHA-256 5520ee7526bb128a…

MALICIOUS

PDF

92.7 KB Created: 2021-07-28 09:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8843b07ebb614f18183fc7b2cd3bc142 SHA-1: 901a0740e80fc986e034318ec36ec086627ffa16 SHA-256: 5520ee7526bb128acff11a3152e441dbd7b5d6e18045a436552116788e208ac2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristics suggest it functions as a link farm, potentially leading to a download, and includes an instruction to disable security software, which is a strong indicator of malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22015998418.pdf In PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/ragiwevejakufubuzubesa.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///39286422467.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da2656bd30c---48080226826.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc89490ba---10782847231.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dbc7d380---52673060951.pdfIn PDF document text
    • http://retailcop.ca/files/zenopodetibotikutido.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/debumumubote.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/xufesofunasidisu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t1422ceir2n442553ou87joqsg/kopis.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210613041523.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/malusefipi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lewuwonaxotawebev.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/44594557197.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/80027388727.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0e9ef9832d49c2b9b1d89ee4291eaa31/13028727088.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/50380674038.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/42a8cd8ddc892464f046f5c16e7c6afc/kewulomazazesotozag.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160881681cdea9---dasowodamowuwupeso.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/65812909742.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/019c0e15b8a084151314955148f0a8b4/zedipamixilalumisawepuju.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/34561876060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+undertale+free+apkPDF link annotation
    • 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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10512 bytes
SHA-256: bfd1dfc20edc23ab70fc82f1e87109a595202caa1633b2a7917c36cbf31c999f
font_01_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E4 17612 bytes
SHA-256: 989914809fdffae099c092eb0777ef07555442b99231d977f9db1e5737d30592

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