Malicious PDF — malware analysis report

Static analysis result for SHA-256 4423a2461c64e6b4…

MALICIOUS

PDF

79.5 KB Created: 2021-07-02 04:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 637b930311a82910ce1fca271540d50c SHA-1: 4066174e5ba9673e7f892978251229f28f8beec7 SHA-256: 4423a2461c64e6b400ce66553dcc7a8a83d928db3cef823a41cc625fa3f2d106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, which is a common technique for distributing malware or directing users to phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or track user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba06132be1---jupuw.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f1ad8ffdf77a49bb845b63235664815c/wojuku.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kajebunuwojutoriv.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa20c2c87ad---31352443192.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab070b2aa6b---35281998518.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/70a8483b76c38c3d3f716034949beb27/siserove.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cdc2b3f714967fb4d9e340835486d389/5192821544.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d974df19c---88865382121.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077843c16ba6---giloxididewudi.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/59421514267.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082897c9a5c5---xadiwasebewamexufefur.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n04knavg29cm6451mgd6gc461b/4159269239.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5e7a799cc---51052348479.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e948939e008e1e6b59fbf0c648123ba6/75355247877.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/62191509750.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/44225366875.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b784c39d831---faborivakatuzafizo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/971h2kl6e0k0qskjn6ta8mpu92/70455899841.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b587d7118---vidunudalixijowoximazowo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/mavevezo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/78513882724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=commonly+asked+computer+networks+interview+questionsPDF link annotation
    • 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_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 17280 bytes
SHA-256: 7ca165a738a460cdab2b150b24b68118515395428503ca9f064d9c5b29c247b2
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 11312 bytes
SHA-256: ee47393aa44c4c15af6131519095e51dd6bac87fa8b27c7c1c3e8bc0f87a1b28

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