Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3d1323e570c7ea…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 21:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 75e42f195254e8f1150b52597e910d23 SHA-1: 94b332ed707fd6e6d8939dadd577a3f35535e4cc SHA-256: 6e3d1323e570c7eab2d7b47d946cfa4331649ca3963ceac20543c3f5d58d4273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de9096e6c---84732655898.pdf In PDF document text
    • https://cissud.eu/uploads/ck_editor/files/mojobedolipavu.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/od99v7hstv4qltoaa8n0gg4kp3/pimezetelegaw.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a3e644fc---vuvosumexir.pdfIn PDF document text
    • http://evola.it/userfiles/files/tinexeren.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/82163111117.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/39079268885.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/77c570c6dfeb2cb99ddc6a4f07e4127f/74377682919.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/koxotisov.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/32216463025.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4801f90b---72598950855.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o74b46e5sas0d7nk3tiilogif2/gobuperapido.pdfIn PDF document text
    • http://klhl.com/userfiles/file/gawujigewumoxuzederidemuj.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/93827245093.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tilojudurufowaj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5abb0271---vitegotokelifozadimu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210604135807_46112452.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/zejinivozemepi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e63bee7b4f---bazimuvazebuzabijupe.pdfIn PDF document text
    • https://motacademy.it/file/24569046237.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/31104579936.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/1mvfqnuelj25e879m7s2mikh07/nileguzedaginomawox.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd8409f33---saruzesozepuva.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17dfd82e6---larilepakepolemuzamoj.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc9edca9b---19233371108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=california+food+handler+card+test+answersPDF 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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10688 bytes
SHA-256: e8a0179391fcbc3dac43051dd10e6d21b75da02f65214b847783d0faaf596169
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16760 bytes
SHA-256: 9a3baf8e7422be88022b6cea1c3d4a90e93368a753d1cd66d873d4f8047e2ed4
font_02_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1