Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2d83e87d0849eb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 21:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb3b9c96656d0cd8ec4b6771de7c09db SHA-1: 8c5721bd903dc8fd2501276f10cee0f6241879ec SHA-256: 4a2d83e87d0849ebf3310c17069739b4e50acd0c70244c494618ddffb4e80044
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The heuristic 'SE_MFA_LURE' indicates the document's content is likely a pretext for credential harvesting, specifically targeting multi-factor authentication or one-time codes. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=shareit+pc+to+phone PDF link annotation
    • http://jandenzobv.com/image_uploads/file/zaferaxefuja.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/siwuvusep.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/siwesisawuroniwi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8e793520f7c5802c771b53e96ba2e85b/98140876748.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3b1gmv89ppoq8b5c12ahu798q1/faferiwuvowesid.pdfIn PDF document text
    • http://kalikraft.com/images/file/37010809760.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/62349558642.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045d1c58c8---noposi.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/10108932438.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xibexoxamowogog.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65291d326b1f8967e58965d23e2c39b2/dumirulipuwegirurezil.pdfIn PDF document text
    • http://staropolski.net/Upload/file/85723793796.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/7785202260.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/184045025.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/3866032549.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/72602118220.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c88c0a4fa1fd0dd00738ecae1b010b63/leletoroliv.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/pikelusadijis.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/deperovega.pdfIn PDF document text
    • http://punaide.com/userfiles/files/38864130827.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/16492611393.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/23315556634.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/3355002264.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t21kj8cg877k7cvf1qsmhr47bd/katefuta.pdfIn PDF document text
    • 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_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 17908 bytes
SHA-256: 71e5ea9fe00a79250f21c6ec322cd3636a096cb1a6ff1eb8ad692a1c558270a6
font_02_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 10332 bytes
SHA-256: e8462a8b44f1cc1cd46e907c911435434f27dea03c27ced9544ab816e2fff768

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