Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf8af76dd9a53ef…

MALICIOUS

PDF

81.8 KB Created: 2021-06-14 09:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2452de4ce40740da3ad6f2fdb49ff3f5 SHA-1: 69bbd805fd22d20493016e1f62704aafb587386e SHA-256: 9cf8af76dd9a53efd3095ac98fa1c66397aa8294acfa9206a170865ca6a42d9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The 'SE_CLICKFIX' heuristic indicates the document may attempt to trick users into executing commands, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pixomot.ru/uplcv?utm_term=free+key+office+365 PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d0e4951c6abf0baf600c0f821ceb61a2/vedebanadip.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b635b228ce1---10211397505.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/3582562649.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e668ebbc---58807923889.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vtdud2pd3tgpvrkmpmthq56120/65919082887.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06981914a3---pepel.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/14315674150.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608607010acf7---60656819553.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/12379115060.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6vc7vpve0ics1td78d39amaq0r/39915758946.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb1d1e351---65217035779.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160711986081a9---98344101451.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce39be720---7583780417.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/89983553264.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/mobiz.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/65097366626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 4620 bytes
SHA-256: 39e9dff78a7d755e4a7c645644b3ef8e53e6bf978da5eb72b922e7109c64c38a
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10232 bytes
SHA-256: cc919e036f124be358a2ae5936ec9a4c98d73b086cf5f5b92577f90d620fbf50
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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