Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cb976b1a90e9a1…

MALICIOUS

PDF

91.0 KB Created: 2021-08-07 06:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8f56808be80dbd97a085a1ebfbf4383 SHA-1: 1204fcefd4d95dd72519703e79b8179c68fef5bc SHA-256: f7cb976b1a90e9a127b07444caa57c75e5d7da14128bbbbdc514e6e45cd461be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm pointing to compromised CMS uploads, likely serving as a lure for phishing or scams. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143c6ab5d0---91319713490.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/vebozep.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/705125f721a47596c05ee5ea29feff0d/50357731125.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f1e2cf602004a045d361fe59e234c65c/loneto.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/46797920479.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/752319a9f618a4b86db1ef4bb8492fc1/naxuvojumonogi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3848e26095---lofotupiwoxilazudebuxanus.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/41321643923.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/58545901214.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/tilija.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/nufeguzewulusixulo.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/razorirugekeguxanume.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/wabewaxasudupizimo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/84886472329.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f6e6ca91b---19709416370.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/97d016f9c583c8ce4d6464137030dca9/85576259969.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4fac9b90---punujeda.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/84331966920.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeaa11ce0a---jiluj.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210706212751.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdfIn PDF document text
    • https://medtek.vn/storage/file/68396471741.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/vitukulimefopop.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/8t3vfdbqi0alh7ugolkragt63l/5795103899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+bkash+account+numberPDF 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_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 10772 bytes
SHA-256: e786d639fcbf485771dd026c17d11269b2f0b5cc4b184cc108e20fd5867dbdec
font_01_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 17720 bytes
SHA-256: e18358e4e41f506233c963b4c1c347f9b001b0c9dfecb23a238ad396d1fddd1c
font_02_sfnt_off00014625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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