Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb3b06626915d6d…

MALICIOUS

PDF

83.3 KB Created: 2021-07-05 18:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f03f933079d03e7658c19110e27fd700 SHA-1: 3edecedb33579b07d54db98fd68ba550b142cdfa SHA-256: 9bb3b06626915d6d9aed92a7dbed0512bf754f2f647b27269b98a060c02ad77a
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 CMS platforms, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://entone.es/wp-content/plugins/super-forms/uploads/php/files/e23df54c2691470fb9bbc08b248f3f59/56495953770.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c21acdf694ff0e5c91a43d84d3f487d8/gonomejogurodum.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/362b8f6c3aa2032d6f7f1393765c30f3/buxajifegomefi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e68b9e96---56369514051.pdf
    • http://stauarchitetti.eu/userfiles/files/67862004554.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607813cd03b19---72012887174.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4c13922f---lejomijapenun.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa16e94c29---sebezixa.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xuwavenezojimumag.pdf
    • https://reitinguok.lt/userfiles/file/satokajusisupanefesebelok.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e166681cb1---23422990028.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ecc06d163cfbaef1991e3b49f1a6d1d8/42137956556.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/934646c5775694859a66fa209fab8838/35208940676.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcb4e541a---xugovepobitu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db02a9c38---97407320100.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607857c5a5b17---30331733971.pdf
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/51189986899.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6651a5f535---43306074673.pdf
    • http://exmar.it/foto_fck/file/dorofox.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0eba0014a88a4b09f581a67ae79313e8/jarodezomupazokipizogolij.pdf
    • https://palcev.ru/userfiles/file/taraziredazefi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+prodigal+son+meaning
    • 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_off0000e3ce.bin
3c70936c3c0ae483bbbb3dd00c2cff4b8ffe75c16f558d8cabf2c8b4eb5677b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 17216 bytes
font_01_sfnt_off0001106c.bin
715125c04c955c6bf0410c28787c7cce9814201560f2be1f141fbe92bf99e889
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10616 bytes
font_02_sfnt_off0001286a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes