Malicious PDF — malware analysis report

Static analysis result for SHA-256 c355d2e9e4db7555…

MALICIOUS

PDF

99.2 KB Created: 2021-07-16 05:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26ec98cfd0d25c630230426c99edd305 SHA-1: 22a20a61184bf77db8386292fd5c2aee16cd4bfe SHA-256: c355d2e9e4db755556711af33b175ebe37afca116434613d55e0b42b8a8bcf99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to phishing or malware-hosting sites. The link farm further supports this by pointing to multiple potentially compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drironcat.com/images/file/88167561210.pdf
    • http://maility.pl_adresuserfiles/file/69624908506.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42d96a36---83737373675.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa11347f32---worubotijolepotok.pdf
    • http://bukhatirhomes.com/userfiles/file/jakobalifefexiwixu.pdf
    • https://digireg.dk/upload/37408995566.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609066708210c---navolipivinivuvuluvota.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/74354484840.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/492d7122cb02e3507f39cf3aeb3be4e1/16217721247.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pebnuv1jomhql9p9jbp6hd8keo/44522649725.pdf
    • http://backupcenters.com/userfiles/file/3272100975.pdf
    • http://docando.es/js/ckfinder/userfiles/files/68632640274.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0eb1c29ea8875b8a03c47f75856b6949/nopesovaxelinowupolet.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l1lc21ef5tj5b7e4tgj8n3muov/basowebagi.pdf
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/wokudanitejanunuk.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/77374955180.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1u31c73vvqqclen9qsavml6v15/98711568752.pdf
    • http://www.ecvbrass.ch/user/web/file/wetowilunuz.pdf
    • http://backkwang.com/userData/board/file/vegozigaz.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ded1f419cf52d5b31762fbdb3c936e26/gilemakarune.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd9bd75c5---badenopoxi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439545f052---48613060224.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/js9f47heoqro1lg98po1e1tmr4/wosetupikokutoz.pdf
    • http://vidol.nl/userfiles/file/nuledadegubudukol.pdf
    • http://dragonspond.com/uploads/files/negek.pdf
    • http://kapsalonvogue.nl/files/file/16886244492.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1e2b7a7f---76116463882.pdf
    • http://fmi.lu/userfiles/files/zirumakinonozivexopexu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=prioritizing+features+product+management
    • 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_off00011d35.bin
a83e88523d59201cf16ba02831ccc572d21658a8b4140fbbbcce294ec1e2bcc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 11076 bytes
font_01_sfnt_off000136e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 16792 bytes
font_02_sfnt_off00014ef5.bin
67172f2314cd1faa5d8776cea60a2ccf3e363875f819a5b2e1bbdee566c516d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF5 18380 bytes