Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65350731a0a82f9…

MALICIOUS

PDF

160.2 KB Created: 2021-07-07 00:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb630774b00b6618c745fe0904c90e29 SHA-1: 1b4593a93ad435d1271a45e426612ac3238f2bf8 SHA-256: b65350731a0a82f944ba296d253994f6c575933ae4a1d5ee7988fad6bbcfc8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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 http://isgsrl.it/images/file/pozulakiwawutukuguweme.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0023c1764f---zugawovobututenup.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/77313087161.pdf
    • https://celebicatering.com/upload/ckfinder/files/depiwilakekemovij.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ffc1ef69---71006010219.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/71892912684.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13aa4ab9a237edbbc8646cafaa10a754/gojalerunewe.pdf
    • http://byty-pardubice.eu/UserFiles/File/31995907236.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/uk688ukuchb5iji92634rj7j1o/lujemazepib.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93fe46ed---zunonisegudajidixev.pdf
    • http://thaoduocvn.com/userfiles/image/file/77980803166.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079172dab752---satovumejubujuwa.pdf
    • http://polipadel.com/userfiles/file/lawakuxotinu.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f338c4e135---dutowizepuxubujozama.pdf
    • http://lideparts.com/userfiles/file/1625183739.pdf
    • http://ros-grad.ru/fck_editor_files/files/jozomemekibubaximimupota.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/boluvudosolijudadogisel.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/93lfdkltobbou4cmo9v71r29lh/71421898590.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/kijadaluzajegiw.pdf
    • https://dolaodong.com/userfiles/file/nesejewoxitulov.pdf
    • http://dolphinegypt.net/userfiles/file/46626706385.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/polofivovokefenugo.pdf
    • https://latework.cz/soubory/58691851500.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160718a3dae1b6---28695350177.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b015c9fa67---bileguburopovopew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=please+run+this+program+as+root+kali+linux
    • 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_off00020db8.bin
fc8a4e4a03d5cd56853dafdb53937d2724f839ebbabb9814a5d06cd58c694726
pdf-font-stream PDF embedded font (sfnt) at offset 0x20DB8 10992 bytes
font_01_sfnt_off00022713.bin
70074302bc8fbf8d24ecc99d00d8cbc37a0beba37b8f5e526999c263b6dc6523
pdf-font-stream PDF embedded font (sfnt) at offset 0x22713 19724 bytes
font_02_sfnt_off00025a94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25A94 16792 bytes