Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fafd2efa7cce6a1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 05:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18bca5b9c34e689350cc017e3751276c SHA-1: f636c0e644b6cca4811ce4d0bddecf7bbac500c3 SHA-256: 4fafd2efa7cce6a11d8a2b7af6ea83dc12a105f46c5bdcd5b8869be4514a2617
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicative of a link farm used for malicious redirection. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://abicecream.ru/ckfinder/userfiles/files/netekime.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140409b7c3e7---7656023488.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/41866762055.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/18246253402.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16144bce295b04---46129120720.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/lufebibo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/dukisobet.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/22620401145.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/55478053769.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147ad59d87ec---vokabetuponolik.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/lorojavavipipulobupamasig.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/wotutupik.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kudekom.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c786e7fe95b3f855daaead580a24dcda/34587518338.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/61752877017.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb17594b1---bavupibabirunugutonarebar.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/wutepuzagovab.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64693569895.pdfIn PDF document text
    • http://chikatere.com/Upload/files/35530506339.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/1980378875.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/28969824615.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/18326487204.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210919075159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=home+workout+app+for+androidPDF 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 18004 bytes
SHA-256: d8faeb26c40d0ecb07701546797bfb61cf4787f3901d587d4a9fb0e34676a84c
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 10712 bytes
SHA-256: 81a0322c41bee4cc5ea63ee763613dd2fbbb451979df64c140c3bdaaabb2516e

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