Malicious PDF — malware analysis report

Static analysis result for SHA-256 d648ddb888507ff7…

MALICIOUS

PDF

78.5 KB Created: 2021-07-06 05:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f9b2a28346b54f3b480a94b8173aa98 SHA-1: 32f0b1ffba10419d7eeadc1c68d96d27cc94b59a SHA-256: d648ddb888507ff71030e77a0b78769ae9ac043c48d5bef89e680d82488d0832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://garglob.ru/uplcv?utm_term=dividing+whole+numbers
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d5e5ef37d31c8eb9c425f213b08c811a/figuk.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/aa245990b84c6f44c7de441de3a7ac55/40415840800.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9fgld48c0b73t4bkl2salp96ut/98712375870.pdf
    • http://jucal.es/images/file/39708457301.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7b09f273556944a2b48133dbc7d9d243/55107427669.pdf
    • http://botosani.ro/img/uploads/file/kevodukudib.pdf
    • http://alnadaoil.com/userfiles/file/tufufijedov.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9dd1692f---sudinixovom.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5c7c2b72---87432845680.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6713cb29---6023013302.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8nbj31cdgbjotkhg4gn9idqs8j/kusupamidafuzamovumipe.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/42418a2c21df81c3742647fa3eff716f/fajakajizimuxasilu.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609479c262eef---rulizo.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c427fd5e71540e8396683bf8f641ed91/kopide.pdf
    • http://pezenasenchantee.fr/userfiles/file/60456370527.pdf
    • http://chromavials.com/d/files/nonapagosenipew.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/265716533f92778243b47c05a316cb2a/zivejowovinawimiramaroje.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/domomigufajobivivarusi.pdf
    • http://biolabsrl.org/userfiles/files/93671374363.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098833d9a061---kuwetakodunibaz.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcd151bcd4---26086629762.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870fdf18c81---sivonog.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fabtg8k7472mv2g4jq1kl02tus/wozawijirisin.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_off0000cf4e.bin
e54232a465212265b071c7b1d06da47d2ec5a97ba923a8162961487cd046ae65
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 17120 bytes
font_01_sfnt_off0000fc58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
font_02_sfnt_off0001146f.bin
d645ea85d05735df28b4d67a0d77c994d8c820d60f8a211896e398ce29e19bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 10828 bytes