Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d85ec73d949ab5…

MALICIOUS

PDF

85.1 KB Created: 2021-07-31 10:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc92d62a81dc2ea21c199b705b535357 SHA-1: dd2dcf74b66e682872848d31222b3afcc66c925c SHA-256: 37d85ec73d949ab5d4dd69ed1f99f51e4ef4266db97f43c510cc395ffadee33c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and external URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f638bc72b9b---labefo.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/13134468818.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9fc31c11---40417715101.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c57f9a4a64b5ba2dd27357af0f08b428/17688662865.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d77ff957a3e87f4ea5b441ca8498ffe5/91868445533.pdf
    • https://alrukn.co/userfiles/files/mowizukojodagug.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210706_236F13CC12558CD1.pdf
    • https://ltssinternational.com/res/wysiwyg/file/80506906351.pdf
    • http://suphammamnon.org/uploads/files/41919913662.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q2ku0aannaan8cfsso7h7g0l19/57407475728.pdf
    • https://costabravas.com/uploads/localidades/files/22603029007.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926ef172896---82048883820.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d40e48c0---94374896106.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be074354f4c---xinukimekokotoledaj.pdf
    • https://kodcomputers.ro/2664/uploads/rimanos.pdf
    • https://binhvi.com/upload/files/dejozinipemotev.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/93dbd12566a36345d8803cbdb28f448b/potola.pdf
    • http://www.kilincsweb.hu/fileok/file/navakisosegidofizulezixib.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8456aec14---bimapuxezoradobav.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/waxob.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445881e528---manotutumubuwokemoka.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa71dc47a5---posijowevinazikasuzoko.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6d97afbb---36293566011.pdf
    • https://menlopark.com/wysiwygfiles/file/21080492269.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b229e1d9---51297171614.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=scarface+t%C3%BCrk%C3%A7e+yama+indir
    • 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_off0000e3b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 16792 bytes
font_01_sfnt_off0000fbca.bin
b7e11a9fb5f5d7f76f578f0adf640fec50b903869e1791338c591ad2916e29d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 19052 bytes
font_02_sfnt_off00012a9a.bin
5f7f45de1774a2de5edf06bc799c929ae4ccdd83548f5419b886488afcfe703e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 10972 bytes