Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63bbbe777932e4e…

MALICIOUS

PDF

114.8 KB Created: 2021-06-27 08:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05565d97d6bf871a088663e879140700 SHA-1: c5fdafbc85def6eeefb36d4fee9374eda8347cf1 SHA-256: a63bbbe777932e4e082a103c00664ccbe744966c4e3934a4a2de2ddd8f184989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. 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 URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f1f1d2fc---75113651618.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8a9d3c29---rafubojamezew.pdf
    • http://midel.me/userfiles/file/40450499741.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c25608c5ea068b75fa8f561b55037db1/xiviporuzidaxi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0465d3de---niroxotebipawusa.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/24bb6fd48b30b35c5f39206da200f3cb/wajimilujelevipapafafe.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608448704f625---bonubujanovilarudemi.pdf
    • https://asiquim.com/ckfinder/userfiles/files/zasumiwaxibemu.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dd69ba6d87b7be2c5e28930e24e8a70/revodapiwef.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3akg8acr8irhha944bafsege94/mixoretujotetuxofa.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc1be211f5---21196289727.pdf
    • https://vasantviharproperties.com/userfiles/file/92512184068.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606feed3a08cb---65642094630.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a3d82877b41c310243985438c506f105/39838305695.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b07cc11f---sakebazuxudowabubevilige.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/14koh5618s7hdi1rfvk0nfncbt/lalovugaxowupa.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8d2f3d1b9830fbadd0a87b28962b3848/rugeriwi.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5cv1r3oqs9apm35u655n6r72er/jofakutixavajar.pdf
    • https://abe-rdc.com/userfiles/file/zogegujux.pdf
    • https://dm288.rs/slicice/file/sulevefit.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/nololamoxagiramadebiju.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160830922230d2---53822933580.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1fb2933e---57566124114.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/20a4d2f480d3afc3f89249f2ff01cf2a/93327520169.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fbaf4126---68315840235.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc7501394---fepuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+aluta
    • 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_off000160cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160CD 16792 bytes
font_01_sfnt_off000178e4.bin
0aca8bf79f92e5b2d5ab8cf1ab1b1b8a226de756de3422764864b2313f623b44
pdf-font-stream PDF embedded font (sfnt) at offset 0x178E4 10212 bytes
font_02_sfnt_off00018fe8.bin
c967ae41f68a3c9f17cc95751ef4d1a82398fa738434a3b6cbd67f2e46cb5332
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE8 17248 bytes