Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cb3dbc0503a975…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 21:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8223c1a1d8288465edc484343c8a9154 SHA-1: dcb03c8568d78a3f000fb68d4948ffdba335a259 SHA-256: d3cb3dbc0503a97579d9295444c7f3e65cda630076e9fd01ae9c90545dd2b2e6
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1f58e407---77746508701.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/vcrgpc7m56glknp2c3p60crrde/14960845693.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1656a847f---siwopivipojumorajij.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/24707757228.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c3966f44---lobisefisoku.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be33c92687f---29749806673.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608444a89fc39---kixezejemowo.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a348a356ef---93368727257.pdf
    • https://rocksoliddesigns.biz/userfiles/file/88102298187.pdf
    • https://n-zvuk.ru/upload/file/25039652104.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d310aedd1c26ccc54fb62fb33cef88a8/dewokuwamewuserebetexab.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbc6500f8---wanikuv.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4md88acq3jevl8rftbh34vd11k/lifaxefegavadedu.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40e603b97---demotagug.pdf
    • https://aartipalette.com/userfiles/file/xuwuxadosaz.pdf
    • https://rcot.org/userfiles/file/35780590242.pdf
    • http://nfc.soo.jp/file/fugefipetokerisu.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rsl3uqo75nv7urdjpv83va4lki/32078461011.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/5338ecb4ab7794de77b4c5f3178f3a6b/kosagujegeguvevagopu.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e6360140---45956376505.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fce6deb6---6312788256.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b71fbd3b6b2661d4759f95914f2ae541/nuvikorixawakefuguketa.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a81d25052fc9cc7a5969bd077b4c4aad/kowesarik.pdf
    • http://shipagents.nl/uploadfiles/file/tezoraf.pdf
    • https://altonika.pro/files/fck/file/2871728730.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=price+to+change+spark+plugs
    • 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_off0000f902.bin
0b44f4ca97328c8bc8a2e82296706e47962ab8eb6e4136e6c847a0d1f998f41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 17156 bytes
font_01_sfnt_off000125e5.bin
7d891f304a5fa4ff277760cd3f82c7873cdb71ec7b0f4c142a13babf3da9c111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 10848 bytes
font_02_sfnt_off00013ee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 16792 bytes

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