Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc89d7a722e25f0…

MALICIOUS

PDF

97.7 KB Created: 2021-07-12 17:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb173501360e3118c274132b547a7b34 SHA-1: 96f2f5b923a59c6a88952e402c4aad812cd0510a SHA-256: 2cc89d7a722e25f0555688ea077bf6c70447d6b9619c0657bbf1ebf1bef133b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608621e5e4df2---bubajogarikatigusaf.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c4bd97de9b5c14450c0e49bfa5b1ab2a/lotizelutiwaxivafabigiv.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4af44473---69810727688.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2gugehrqiks689vp1u6uuqa2lp/41391136641.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/5a84cdba752aec83c414923f9a683a46/doxulezajagutofam.pdf
    • https://bestrecycledautoparts.net/images_i/file/61476874930.pdf
    • http://zhouzhuank.com/v15/Upload/file/202179197195584.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744653811d9---zamaxazeroz.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/47869062390.pdf
    • http://karthikeyanjayaram.com/userfiles/file/zegigaxosevixumuxegelaxi.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c525c32e5da---97871468335.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/78hksguhteausj6t52a0hv1kfp/pobarisupawa.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/921f05adc70fe27de41924eb68051e2f/8207667837.pdf
    • https://khanikango.in/file/71558118659.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/k2k6bbpdth774hg5r0p3258djr/zakifaguni.pdf
    • http://vickerycarpet.com/uploads/images//files/balojiwelidum.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db03d51bb---98552835930.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/a8s9emc7foslfa4iq6fqqj06e5/jizijefepovebojuzutaxem.pdf
    • http://tanabuauto.com/js/upload/files/xetejikifixofoxovut.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babacfb73d1---nibobotikeran.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/aa733527ff906f1fd8640d2599913714/tazubamumivepokujix.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733716eba65---lepisisiravomemejuzejova.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/81394457545.pdf
    • http://whs1979.net/clients/65916/File/67212014162.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ca3bb4ea37745af623581ba345292a48/fatifulil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+download+fifty+shades+darker+2017+full+movie
    • 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_off000117f1.bin
2c83e36824565fc5d609caaffe6526d0ad59678fe646b0c9bbad96502a677e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 17604 bytes
font_01_sfnt_off0001461f.bin
6303323a68524f398ea277fb3ffd6c88b023873cd43f7beb3a4eb57257bf553f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 11396 bytes
font_02_sfnt_off00016105.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16105 16792 bytes