Malicious PDF — malware analysis report

Static analysis result for SHA-256 d734a2122bdec69b…

MALICIOUS

PDF

82.7 KB Created: 2021-07-26 19:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15de5679569453c5eb04c893ba4fccaf SHA-1: bf32bebc749ef8ee25a7cb33ac3b49d7b5430008 SHA-256: d734a2122bdec69b5aea13e2466c8acbccced1dc1d59b44b3174b38c4592db27
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm or distribution mechanism. The presence of multiple compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93a81d802---xigonaxitomivijaparewoxi.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/35811551483.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/1823115556.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a723101fccf0ce010a4296706d543f45/67007763662.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dffea255---tuxalu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869c9bb306---limowigokisaxutawoleku.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/68982754215.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/40045690054.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/22932649591.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/duzopeva.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/bufipixezugex.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/70953070596.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afffc7a8097---guromuji.pdfIn PDF document text
    • http://spiregene.com/image/files/20210713_153638.pdfIn PDF document text
    • https://blokhol.com/upload/files/49620030941.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/8996212054.pdfIn PDF document text
    • https://lecapsuledigian.it/file/15309321991.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fazalekokoxozos.pdfIn PDF document text
    • http://wawa757.com/uploads/files/33026626019.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/8299481905.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/78926002157.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/49360130866.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1950b13116a7eb440adf89bc2a8115e3/74095652183.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6cc83f0a40a73ac2342d80b7f11989d6/45932914537.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d52faeb6c---ditonuwir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=reported+speech+exercises+with+answers+2+bachillerato+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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 11208 bytes
SHA-256: 058bddecad28423ea9ae19e32e62335c91da38991e84780075b9eb35fed16c1b
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 17484 bytes
SHA-256: 341fbcbe1fe7f1ca6de75819353919b13d0a2d8a6e63286087830ee046afc877
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1