Malicious PDF — malware analysis report

Static analysis result for SHA-256 3febc4b44ba6083b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 22:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9b4e1c9c9e414a206c864799eba0693 SHA-1: f7ab78ed6fadd0c56851ca0d237aa6ee0ad502e8 SHA-256: 3febc4b44ba6083b53dc27cf9192143e4b26aac08937fee66e7d9c59c40442a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a link farm on potentially compromised or disposable domains, as indicated by PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, suggests a phishing or scam attempt. The document body is heavily obfuscated, but the overall structure and URL patterns point towards a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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://pro-customer.de/userfiles/file/dixivi.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd22e47ca0---vudimosejazujazetuw.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/55413493220.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/29015433046.pdfIn PDF document text
    • http://mfcpavpos.ru/file/26211107582.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/1401165040.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ce323b31b9afdff7beb449bbb144c470/13889183929.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/aorc7cgmtq73olb1r86uar4f3p/risinowo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sisitewudodu.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/37863900083.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/3589979701.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/78170123045.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/66839786488.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/masusufozifap.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/tovapamaruvum.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/11529385956.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/36541049494.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/90202232118.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/kinelipuwele.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa49576f5a---18626393696.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210920174855.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1f46d0e8007221ab4295d7ada192131f/75552593075.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/fixivirewajepovapojuloxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mod+free+fire+minecraft+pePDF 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_off0000c479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10560 bytes
SHA-256: 2bbc0b9495725c7cb500f1c3cfa9883bfe65e5d321a8f16eab5fd91c025e18aa
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16984 bytes
SHA-256: fde105ef971e34a08d755c2e52349cdcd9c53ce7696f2137d33f426b6b241f7f

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