Malicious PDF — malware analysis report

Static analysis result for SHA-256 7131c841f33d5246…

MALICIOUS

PDF

116.8 KB Created: 2021-08-15 15:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3a479d6cee0c82dd4598ea72ee3cd6c SHA-1: 88da52073e4847ba3face4dc6ac63513b75a9328 SHA-256: 7131c841f33d52469d0b96c29fc42e62ad8d32074ce987d1e92290b3aeb4498d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document's structure as a link farm suggests an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ab6ae606c---nokezamovoxajubebavu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a205b154d38---7607651531.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/25150478979.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8mqj4obh8s7k62j3us1s3vpqpl/vusojazekabumoxur.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758629504a3---62684236603.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/68122596393.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbefeecfc0f---mugewedubalakubagumuseme.pdf
    • http://geometracosentino.com/userfiles/files/fokipomobojugezovo.pdf
    • http://rencontres-icare.org/userfiles/file/40032399765.pdf
    • https://m-astar.com/UserFiles/files/lewotakifobatidido.pdf
    • https://begili.com/uploads/image/files/9387900702.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f921901691c1e1b0e752d675963155e/71107223116.pdf
    • http://studiodrago.eu/userfiles/files/17816323119.pdf
    • https://egyiksem.hu/uploads/file/goxorogezazofag.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/pavepanebovuzigezi.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42b708481---21199024852.pdf
    • http://hoanggiaphatland.com/uploads/image/files/83195527470.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebdc9182c---vilorodonugoluji.pdf
    • http://amon-syotengai.com/userfiles/file/43613436362.pdf
    • http://droneducational.com/admin/userfiles/file/51493556894.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882854bc24c---34709419625.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/22803134116.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c26311696---jemafigodovafefa.pdf
    • http://lovesenergy.com/file/zuwone.pdf
    • http://goodslib.com/userfiles/files/vidakobidusinotekepesadu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098346908818---tajidukumazaxa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+another+word+for+physical+appearance
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacf.bin
e252f8c8612460d62a4c9ea15d900e8d989806470e36c13460064b42f342e5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 10908 bytes
font_01_sfnt_off0000f418.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16792 bytes
font_02_sfnt_off00010c2a.bin
2526e6b4098ee0a7b75482409dd4a2f4005205e83fae338341ae99ff1170a41e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 17492 bytes
font_03_sfnt_off00013a05.bin
226a44a31bddd2b03b9d48ffec595abeaba3620ac44f013555a6ef572cdd9afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 52216 bytes