Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc1d6c246b8e41f…

MALICIOUS

PDF

94.1 KB Created: 2021-07-30 18:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc4d5b4cb2c8eddaa8685605f5b9190e SHA-1: cf91aa119ee3cb4eb32ff2a532c430be249483a1 SHA-256: 5bc1d6c246b8e41f0b54745d9e990d6c8ae8e2bfe6b27434e2c13ad4f27f62dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=what+is+star+blast+bang+supposed+to+taste+like
    • http://vom-ragnaroek.de/uploads/file/fojevu.pdf
    • http://ecole.ru/text/images/file/7692601505.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/lonokawa.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/59693149799.pdf
    • http://energy-labels.com/userfiles/file/44221503703.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6080884ba---71094538956.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f062dd3055---vimorazet.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91d78484c---20175299131.pdf
    • http://betonkeritesek.eu/Content/files/6209685157.pdf
    • http://lucann.com/Upload/file/19364904628.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c3a8b369cf5e3aacdebc3e0e63bdb31e/kogesosexuxa.pdf
    • http://rogo-rotterdam.nl/files/56825853191.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bda298fd6---davawebobedojatojamapav.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/46457695433.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210718211532.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qkgd3pqc39uke6ovra19dmf5v1/53212461029.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/90250092600.pdf
    • http://mid-europe-ex.com/images/blog//file/67563575284.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bf17f21644---25600241184.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/onsqd64kun62hkl54fdklejcla/73764422340.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441a399ad---vomawozum.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/127fqo27simdh6k2sgg08fcjhg/13969667665.pdf
    • http://briquettemachinery.com/d/files/6725085035.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/kqhf7sbs4pvjnhebrla2gjmqfl/82402074065.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091c.bin
50c8e1d90c4a0ecd748ce283b6d803d692007a7c23b0d8d89de52edb05e3be78
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 10996 bytes
font_01_sfnt_off0001222b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 16792 bytes
font_02_sfnt_off00013a3d.bin
63f1822823186aa5f1ea705d4355aa1cf4eddb9ac2f42e4afbc306709f41caf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 17440 bytes