Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0c20ed5b4a9263…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 09:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40ea18bdd8b17a57b6944f4a05ef0a69 SHA-1: f91d570068cdbd79f17fca009d2d3008e2a4afb4 SHA-256: 4e0c20ed5b4a92630ad0501e4567ee8cca4e987911e7c7d43153221ffedda61c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and a raw IP address, suggesting it's designed to redirect users to malicious content. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://185.33.116.145/~acus01/upload/files/73658726788.pdf PDF link annotation
    • http://rotarycochinharbour.org/ci/userfiles/files/49442636748.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5cbf1af575039972024ea4268b2ec32a/87847757547.pdfIn PDF document text
    • http://coumert.com/images/file/nipinikiluja.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62963471392.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/nowolepabozelep.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a5k7v5mv6nohkbtkec54tmigct/7929142856.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5865a0222---tunutid.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ed80f2bf---niribuxukorexenobuxesi.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/wemozixoxiwitelimiwuwuso.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/5193534052.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/3226055884.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/28542385811.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/zadaz.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/vubatuzabodatemuzizunu.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/87484786977.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f3b8726b875720327dad1a9cd462d99b/16076462742.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613914238b907---12555619833.pdfIn PDF document text
    • https://kimcert.org/E/file/balifegilufikazube.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140083a7210b---sibeku.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/40251706124.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/zuboxugideraviziwe.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/2834205101.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/vasuletamobopopuzotig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=groove+machine+mobile+apk+free+downloadPDF 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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 19364 bytes
SHA-256: ddffe3648fecac9d5c3fcda6f8f6460819c900c08c12a98a5ffe03fdb24cf33e
font_02_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 11044 bytes
SHA-256: a58164f2754411a17c1e1b381d1c0004ea0ca1b86a1f02e14ff403d4a88c7bc3