Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d506294275278b7…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 16:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af4079f388a63867c058905c303967ea SHA-1: 577493f2d549a273838b80820174b8f19c79876a SHA-256: 9d506294275278b7c38d95f4dbc28f879bd779a0b882adb6b72c8cac696e4737
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content or intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://komputerzagrosze.pl/userfiles/file/depagu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847e781e432---besovaworijerupetizabonu.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/pigir.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/baf7cc835948d9573551858206a2d0ab/mupunerosano.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777fc0d87a8---50435312276.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f25347bf75c901d912ed3488a98eff0/75355799188.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/65c3o8pmumv7hca43hgu2r6cac/355202683.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70befead52315c909dcd2bdbb5fbf748/fopotud.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096829637cec---43645761788.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b30af91c---15325649197.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b518ba0184---nozowefunorofixuta.pdf
    • http://www.bandungmesin.com/file/38127093844.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/44137ada14ead2cb8bdb63310438afe1/zovepusatafuj.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90839d5093---zegufarirozubovorifot.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/85abbc552b8ba27e0cf740f271253617/kijewidaxijoke.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e6e1b91f---72905788217.pdf
    • http://baigeleather.com/userfiles/file/kapusemumanogeziga.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f8d2f05edc20263c96e0223072f0abd2/vumotofu.pdf
    • http://caigeshi.com/uploadfile/file/2021062709484473499.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/61f71b2e811a79532f087ddf54533913/bodesepagujetunepumokomen.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7840dffb76f87722a46a86d2dd27ea28/94227489299.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/81e7208ecc0769f703c18ca05d334241/gagip.pdf
    • http://humanitool.ru/userfiles/file/jibufapaxew.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/abf26d4143ae998fa8fcd63a0636d10d/dazubiz.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1f72e60c---7388745530.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nausea+after+eating+fried+food
    • 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_off0000fd2b.bin
0df35357f303b71f72674c49465e483493a1f174fc7e84934a1433432f391393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 17372 bytes
font_01_sfnt_off00012977.bin
0cb9d09c7b588f4ffab5ba7f1c20eddb51785724cc6ca1a2e54ef2c0182ec0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 10560 bytes
font_02_sfnt_off0001417e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 16792 bytes

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