Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab907a0c5db212a5…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 21:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5ed328ae184502feef71059f1a48c35 SHA-1: bae05f3094243f10eb1f8778b5ddb82d6f864cdf SHA-256: ab907a0c5db212a512af1c7263d4011d7adaa7e02aa2042fa8c0f36abc4383b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured as a link farm to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://chcial.ru/uplcv?utm_term=toddlers+thumb+is+raw
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f784ac2f3---93268162509.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f3db8a466aa0a6dd8b325467e57bd78c/mewed.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e5d78126c3f83929c72bba4791afb52b/nadatumejelowabedisanunub.pdf
    • http://naturalmis.com/userfiles/file/zevekesevojejapujemiwo.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4f8314f23---selimudet.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d99337ab7---supagevonuvazeje.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3c54b8ae---23050689589.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/getefolelewobuzedamutej.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/14rnpjtomq16v1qh23sk2qd5c4/50093527225.pdf
    • http://alexhofford.com/temp/files/file/86390191036.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/32ee436fe4dee878b23b3d571d835165/duxuri.pdf
    • http://almar-bus.pl/userfiles/file/mezidudujejasani.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a51b51b4---21968911915.pdf
    • http://ahcxdq.com/uploads/file/12024720625.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/v5vqorfamdo4h6l9k8tn97mu6c/kepexugaz.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ae5c9c1093368b6d3e56c64d2a0e04ae/87286948316.pdf
    • https://alutat.com/data/file/mexozenemifudurakar.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af68631208---38311928511.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702232b4d8a---65589008651.pdf
    • http://afghansolar.com/userfiles/file/fatop.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713b8770bf---77571782775.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089913aac774---54844388199.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d6c7c51cc8c6e610ba4010293b144d30/renajakefexoluxo.pdf
    • 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_off0000f752.bin
2135a8dc42db8e6627ca1eca75bb669e09fe0e9adf43cab1eb86bec4ff448969
pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10696 bytes
font_01_sfnt_off00010fe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 16792 bytes
font_02_sfnt_off000127f8.bin
e5a7dde95980c326956f5bb3fc545ffcc43cca304f8d951dd424d22f9290cf13
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 16844 bytes