Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b924071049ff6c0…

MALICIOUS

PDF

103.4 KB Created: 2021-06-28 09:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a2239e1f763ecf415edac8c55bca9f0 SHA-1: 33df49552a0c556d08f2073e1a8ece64c41f36e7 SHA-256: 1b924071049ff6c0197957560052b1cab7455fda3f3984dc6382f67d6c6116f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://cesmclassof68cheyennewy.com/clients/82478/File/80181906808.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092c398e3f94---nunovogadepuxil.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8935d7e063---sowerijopurabilakatu.pdf
    • http://envigest.cz/upload/file/punipigixepitipezom.pdf
    • http://banlinhkienlaptop.com/userfiles/file/31551459858.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fdc43256d99b2c847f5fd1d006542902/wamopugino.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/16153125220.pdf
    • https://tortugafilms.ca/adminfiles/file/lutudab.pdf
    • http://dejede.com/userfiles/file/ligetijizavibuve.pdf
    • http://botosani.ro/img/uploads/file/20252314735.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/repopefiwenimeb.pdf
    • https://thefencedocumentary.com/adminfiles/file/68187800.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c59aa5bc99dc43c7b6729b25edffd550/nazufirer.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/71f365e4ff7fa9917284cfe8134d5d5a/29292276604.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160782fc6f3a72---rugubemogexitavato.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae6cb309b---faxolidotu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774def62a2e---mepolobifovojata.pdf
    • http://ceomit.com/fckupload/file/pojuvaveg.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1a356d8eafb893ca1acd76e96b6e2857/retazurixoj.pdf
    • http://ei-windykacja.pl/upload/file/masezebibuxapajotiladas.pdf
    • https://performanshost.com/calisma2/files/uploads/fobabujunokubaxitunuribis.pdf
    • http://alexlunacoach.com/img/editor/file/56121090667.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/gotagojijigosematewu.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/towupupa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=call+me+by+your+name+online+movie+free
    • 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_off0001329d.bin
d40aba57f8800263c65576d4ed8259740f340136c9e2d87ebf9204807dfcd052
pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 17504 bytes
font_01_sfnt_off000160a2.bin
4a433497760f2bf49a52658adcca01fdd2d79ec0a6a378a909c41063f6d77015
pdf-font-stream PDF embedded font (sfnt) at offset 0x160A2 10560 bytes
font_02_sfnt_off000178b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x178B1 16792 bytes