Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e214fa86ac16166…

MALICIOUS

PDF

86.8 KB Created: 2021-07-08 00:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c4a3cd590ffbb28186194a86d09d345 SHA-1: b515ddc151185c8b8c3a792c02287b5ea2766cfd SHA-256: 5e214fa86ac16166026ce7de1efa91e97f74afa0243c75f6172b61522db25b4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=apa+cover+page
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7cd93a7a---94825448710.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eaa3bdad2---wezopomimuzitu.pdf
    • http://velo.hu/UserFiles//file/88647892864.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866d2754ff8---34510225375.pdf
    • http://apple888.vn/luutru/files/68480148028.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/445a5sop0t1j7tc20j0k8fcl3i/nobozenususodiza.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086148924990---watatibofokorodiwozad.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/6264baa07332077fe45f7edf4eb155c2/ribulibixutizavi.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e07aceb2e---80931594562.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a1fbcca786---94474308185.pdf
    • http://bogelaipigeon.com/upload/file/76818386320.pdf
    • http://bluekeydigital.com/images/pic/file/kelupirujibapanodozo.pdf
    • https://ensegun2.com/ckfinder/userfiles/files/pezipuloranozolivu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d34297a53c3---91032148521.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/13723dd755f76665ad83facc04daf621/51280525714.pdf
    • https://nezrenpin.com/calisma2/files/uploads/xabegiwezeruxawe.pdf
    • http://riversedgefm.com/files/file/xibomuwif.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99a13069b9---gigolenukubagikenumule.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89a50d1cc---75426011425.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1e35b2c6---62552203188.pdf
    • https://bloomland.com/sites/bloomland.com/files/xudofusumosunugudolowiw.pdf
    • http://alpha-cp.com/userfiles/file/susagilaxitogibir.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/b3125a0b4d0fa30aa17770b80ec0f429/94702909494.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/3685468231.pdf
    • http://waukeganeast1980.com/clients/877304/File/20119217843.pdf
    • http://alwaditrading.com/userfiles/files/68017440531.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e94173fd---77373066838.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa71e0ba3---17327831705.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_off0000f345.bin
5f924e7b7d29daf30c35cebaedfa021e216e706d6ffd75028921b6fa47c3fa38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10088 bytes
font_01_sfnt_off000109eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 16792 bytes
font_02_sfnt_off000121fd.bin
a73af0a875a63c3b208b21599f86f360245e06b507291c34f46e9131ff6f499f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 17048 bytes

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