Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1db30d084c6aaf…

MALICIOUS

PDF

95.6 KB Created: 2021-07-07 00:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a280d569cd8f3d6797ed6ced10d9115 SHA-1: 60166627d80c694e1ed8c27dc8db5a667952235c SHA-256: cc1db30d084c6aaf6e413d04754ec70bb1b0811afda82e04be629e53b72ba7ff
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://barcelonasixtytwo.com/userfiles/file/papadivuvade.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf195db6b7b---51261607273.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e9986779ec2f0b130f3ff7409c964ab3/giperunatowadozebud.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0a7a433ac23b1c402f074bc3e8314ac0/riduzotodu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/64774180920.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee8a7ec8c---raligip.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350e3a4195---84787174508.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764f753e023---pewiwixosofupa.pdf
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2skh6r9ob8sbklpa1noscjihq4/45052785685.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb80a1a10---95339381203.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hhk01sck7s2a7bdjr6om2u5hng/37421648209.pdf
    • http://baigeleather.com/userfiles/file/78039583386.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/gke9q04eg39d5ubek49uehf766/mumegaxazinajik.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kevezunaki.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rv5m9928fercjd6tq9jtmsbsn8/toxedezipuwatix.pdf
    • http://ncabhsa.com/clients/875427/File/zodikewituxodifeno.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/016d8ba60b22f24c02ba8127d3ce2860/13081771412.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094daa9ca865---76536578713.pdf
    • http://bollywoodsalonskokie.com/admin/images/file/22747818957.pdf
    • https://alajuusa.ee/media/contents/file/pisudegafuxoputuxuvebubup.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c995b72d6f1---zosokobugad.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4756b5271---mefarekobeguzuzo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=weight+training+for+distance+runners
    • 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_off00011075.bin
9039b2fe2b13b60fc9ac5e8aeda2a8527acccb77413f46ac196d287d0a7cc8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 17784 bytes
font_01_sfnt_off00013eb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 16792 bytes
font_02_sfnt_off000156c9.bin
66bc2a271a5e983dc184e3c81b18aa182b84ee3df2f402ac1f8f2dd64f23bd73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156C9 10800 bytes

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