Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d395b406977b97…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 22:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 405cc6434205e2aa5b97e1131484eb2e SHA-1: 84281bd4dd98c7e07766a6df95e0d9bad1cda930 SHA-256: a8d395b406977b97711b8db49a3efa238efe7a8cbdefcc2179ebe270dc62724f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous links pointing to other PDF files hosted on compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of urgency and callback lures further supports a phishing context.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/eee65e1699c205b135fee0ded201ba88/lirisok.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2b3b1a3f9---2045130589.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/kosivorajotinutad.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/bewexugekonavavedub.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/lazofadalipanuluzif.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/37474143182.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/zenedatijabameboxinevi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612354bdc8b4a---27345384234.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/jaxaxes.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/nupipenibedesukok.pdfIn PDF document text
    • http://contactconfiance.com/files/files/jazolekejofalinixuxo.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/53481440301.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/54935442366.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62d07af6f3---27475592999.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afcea001b3d---81080357040.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/indht4sp5dvon10751vv898k9t/runumuxiwiw.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/90959996185.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/81920544315.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607733c0797f8---gawufiderujubizadez.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e88842ec---98045011645.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe07aac69d---sisazol.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/67995639230.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bfba2c66---33165920335.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/54001911140.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607203a10949b---38160909835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=flexive+creme+bula+pdfPDF 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_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 19016 bytes
SHA-256: df64133eb9e02081422d1e2ac64555f5c58cb13a687ba3dafc648e828858bd87
font_02_sfnt_off000145fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FC 10676 bytes
SHA-256: d4e3265a68cf36ac5647e95762400181ecd76f21bb7672a2135af1bfc569d072