Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a907e38e9da5754…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 09:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3554c41bc02445f8bf9d43c057e42e6b SHA-1: 5ce509104ccd4e7f37add285f59aa763ca90e5d3 SHA-256: 3a907e38e9da57543c2f92deb6258fa8f0b8c4178f6707cc77599eb786b7320c
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or phishing pages. The 'SE_CALLBACK_LURE' heuristic further indicates a potential for callback phishing or tech-support scam patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d9e7985b---84229092125.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/b5jchms68ogv7sfod1k7l4eajh/neviriz.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/mirukemakurutivagusuz.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sabazarakotiguvarupo.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/rusafogadavoj.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/14248031202.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2243488a4---razamuzenupudotudexa.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/3440842302.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/degup.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324d70c949a---tidazaxawubimawutani.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/vimufiwifirip.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/furusojifutevofaris.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/walegedu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/99567215361.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/57436123159.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/87812880718.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/198fe59a92a796cb11ca0a2202254bd8/vepukonafaxubediduxute.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/tizejajoxevavowolifevizu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8c6dfcc99889e8879b2c628b425e1923/71670661164.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/wegofikolokuxopejejit.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/vilidusoratovukegex.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/lemixejitulo.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/fowajijup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=itv+player+android+not+workingPDF 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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 17284 bytes
SHA-256: 1a5e2a061304cdc2ba63bce7f6d079a681b013c0536d8eb743f55027e2f58cc6
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10708 bytes
SHA-256: 73d59f98b4a065a843eaa24fd815e3bb8667d9ccf5c8e3c1bbf658c67d2651bc
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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