Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661e984186a0f1c…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 18:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ec5b470729692d082a5ee703030cf2c SHA-1: fde24530018761103c8f777cdda436a82ce40d76 SHA-256: b661e984186a0f1cec7a01429970d53e29df542138fe70ebe4e05b29661ddc47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, presenting numerous URLs hosted on compromised CMS uploads and disposable domains, likely to direct users to malicious content. The presence of multiple PDF link farm indicators and the ML/AV detections strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wagaskar.com/media/91414713062.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/3qaacfv90rrp8r1fjofl1nq57f/jilajosuro.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3006cc9403---24341247728.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070976346901---44987036505.pdf
    • http://agt.es/files/galeria2/files/61013949230.pdf
    • https://cmoretv.com/userfiles/15180687303.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c162626777a---fatepaforofijugutosaba.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/h0j25sr51k5bvcho2l9pi55rrq/temuligadusozavi.pdf
    • http://pathtojanna.com/userfiles/files/40334315883.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/8857167723.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160865d7bd39bb---xurujovogag.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/eb81ef9fd6cf1162abf61c2e47c544c6/gajokon.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e279d982d---fojinojiranabubogev.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/13488481887.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/327eef02b4824ea219f1350a1c67b35c/18680622820.pdf
    • http://bielwod.com/userfiles/file/44402095842.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/50755696811.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2517bbd7e7---9770314985.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/de8370f7ea7ad76b3d109fb882642372/nibenulapog.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851e0d5a29---16262167738.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9j18p07hkh325u6ef345004hv5/rilenaledovomonabifejapad.pdf
    • https://eyetracking.pl/userfiles/file/10611404960.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ed5bbdfc---wipej.pdf
    • http://alpinedelhi.com/userfiles/files/97794814939.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+young+pope+download+torrent
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08b.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 16164 bytes
font_01_sfnt_off0000f5fd.bin
708a92701297b12ebd7cc17ff9a9de4252cf98dc66b20ee1db10a8003b4e57ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 19712 bytes
font_02_sfnt_off000127c5.bin
d90da23e1c71c1f2643a297eb8423f96bb88342a1426c687f67d2d6048129a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 10672 bytes
font_03_sfnt_off00014011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14011 16792 bytes