Malicious PDF — malware analysis report

Static analysis result for SHA-256 66215269b94af377…

MALICIOUS

PDF

101.5 KB Created: 2021-07-28 10:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07783c353c9bc01dc2074e0e6b5336bd SHA-1: e9927bfd4fe50e0fe42f30aa2681d0f95ffdc4ee SHA-256: 66215269b94af377e63945aabb442b431c83369984bebdfe7c523817b841e221
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download' button lure further supports the intent to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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 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 https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3531086ea---segajajesobevamur.pdf In PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rowifiropopavajap.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/41681797109.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/744238f524846807a71ab721b94beee4/85795398442.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/97708935575.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f912dc28b---28955389012.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081957bccb78---liwigowunuzezefosiloze.pdfIn PDF document text
    • http://sartor.ru/upload/files/61414738082.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8bcb9832---jilafifizotivewosatinub.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kurujumer.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/73549950123.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/406e172bfb0aa710e18bf34802e452a2/82605605682.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ba63ebef87b1bc243c257de80fd87f92/1587268509.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/kodofinefadoxujemekak.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/86084427985.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7c5ccb71e1749493c5db6a510226cc24/tefugowadumumosukigujil.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/jeseroler.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/93035443516.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c9cb0e255---90740516202.pdfIn PDF document text
    • https://yellowstonewildlife.com/55460613881.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/fuxapopibit.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/5745710121.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8519514bc---rusosefesajoberawelofarek.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1d3e90fc---9090957913.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1068db3149---3381996703.pdfIn PDF document text
    • https://ferropula.hr/files/37091214160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+gems+on+episode+2019+without+human+verificationPDF 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_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A47 11724 bytes
SHA-256: 749d4b6acb8656316580280d4a0355e98cbb097650284ae2b465afb219cf7fc3
font_02_sfnt_off00015600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15600 17844 bytes
SHA-256: 41d088c6f9f9ccf7e7b71417e1d8447536e87fd7c143d676f1b0b9892fbc5cc4