Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fac777b34a86ce…

MALICIOUS

PDF

92.5 KB Created: 2021-08-12 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1d6a75853c7dbba7cb0ab7c7cf07f60 SHA-1: 1227d5bbac0636cf4bbcee6aeb46a45a9247d5be SHA-256: c6fac777b34a86ce1f973ef2dbd055909063148ae0ca832c894dc7117aa4a4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate this PDF is malicious, classifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=how+to+get+purple+pansies+animal+crossing+pocket+camp PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b609770ec8---ligimutizozagebudolig.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/97876928558.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eecab511c---demomuropedikilimexeva.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/42945198724.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf5bc385a8---6920085383.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2e2c4880---gesuguxile.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823c0fc6f0f---budosesitixibijovidigu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tajotaxureduferumunujod.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ac8ee4376e8af66c7dfc3561672496f3/pidexujenufetigake.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6c0a57a4---39111324560.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6111deabff49398d0aeca8b1c9f7d530/85393008086.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/56404548627.pdfIn PDF document text
    • http://12shio5.com/contents//files/fobagapuvexet.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/simuvujufezirelador.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a31dc5e7ace1bdaf7709519591e6f98d/30374006164.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc94babfb---zupizitavakesu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xamabuwupigipuniriri.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/bunudufo.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/nabagukenofubapi.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/32323494356.pdfIn PDF document text
    • https://theurbanthinktank.com/files/xixulenukow.pdfIn PDF document text
    • http://castel.lu/userfiles/files/mitenawunopulikebavose.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e14ad1585d6---84719806712.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/43108675417.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/riselalasuwomata.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10984 bytes
SHA-256: c41bc5987e9142cd9f1194de3721b392bd26e3762ba269e29b339489f52c86db
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 17128 bytes
SHA-256: 60263dd9de8b78a6adcfd492d7a2f651e450cda3ea79d9312a8bf7b1696380af
font_02_sfnt_off00014abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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