Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d15ef75147bf0…

MALICIOUS

PDF

95.7 KB Created: 2021-07-04 14:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67e5cbe93b232e12cee629e412141913 SHA-1: c3e23fd6f04be23e22336e979a4a5230b3cbf38b SHA-256: cf3d15ef75147bf02eb17abbc534d2fd5421a79160624c485e71dadfa4e4f4ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score further indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0cc57346---danadiruza.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0805d20d106b5d9431133f24a2433b7f/60397161931.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b371cd25---45124715045.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced2fcf52d---tetife.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079679ed63e0---jumaforig.pdf
    • http://fmi.lu/userfiles/files/62650526842.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9421d0f630---bomojojemajawelef.pdf
    • http://ahkjt.com/upfile/file/sijuji.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f841de06ea---38409379629.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/53bb024ec173629e891da87a98a163ad/95054419336.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e9js49h05s0cst9ui7iltqv9uk/purarono.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b2cb848b---30745315256.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ec1006k3i6rrohkqt3drd6t9qn/vumodozosa.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/sesekowasaburunobopo.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/67121a1de16182536315521a3034d971/35593361829.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8fe85b95---xuseduduzejebodamagosiw.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d404a56b---jobomojeveziwodi.pdf
    • http://hyundaiokla.com/uploads/files/zodefakuxoziwigubefagu.pdf
    • http://skrabl.pl/www/rpbd/fck/file/fupanupukuxekavonikukutok.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/65140198fcd97b41f68680f62907adbe/15035381889.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160739067ae947---43211017269.pdf
    • http://sequirk.ie/userfiles/file/kusibubipetubosasamunubo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=defamation+case+against+police
    • 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_off000114a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 16792 bytes
font_01_sfnt_off00012cbc.bin
e3126c6f90c7a1e7be9e81de72ba3925faa6b145efaa0ff2f8e93c854c1486ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 10724 bytes
font_02_sfnt_off0001455b.bin
c37f13b68c1429437349284a99dd82fce96fada3d15e42201dddcc83e23ca9c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 17192 bytes