Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2386e63550c1d35…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 08:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c52038915b386e9293c320319f83d7e SHA-1: d02b842c8f3657c29224f7f693c28e3e9c13bec9 SHA-256: f2386e63550c1d35eec33d985121f616d55ffd1ed0f0afad8a522dbc0ba6c37c
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 as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. No scripts were extracted, but the structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=technology+powerpoint+templates+free+download PDF link annotation
    • http://angeladaniel.de/uploads/files/32236541771.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728e102219---motogaveraxoworu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a646793d3---65058434264.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dinitabekozadomugome.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210710114810.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/87989981597.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qn7u7fmv38c9cdi8gmurb6s035/52874697798.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787db922dec---babewurilasebukumuze.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba0ce01b1---kuwigawezomibelod.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060123055637.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/94923127343.pdfIn PDF document text
    • http://liyangah.com/Upload/file/70795275083.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235c040fe71---fiseremirinipomajas.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/selawaligidaribazokif.pdfIn PDF document text
    • http://goref.ru/files/file/jubedoradiwurorow.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/72359f0de67c490cad771e92b05078b8/61008763815.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wusodivizupuvov.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c51490b---47938751133.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c14e7fba9fe1415158ff27b42d542ee/18338486502.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/26612959887.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ca932508---zorimekuwobibajibixedif.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/98e4af5e7ac2892ceed79613f76eff29/laradunokaw.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/3408860109.pdfIn PDF document text
    • https://yuss.it/file/76832294579.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 17900 bytes
SHA-256: f756c4ecdc5fafc351750d7f057a63259759e4ca261b854291bae89e8c6938f7
font_01_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 11228 bytes
SHA-256: e6cc6121480b0e4f41a25a2957ec12152250db8b4e2b1f6f188cca75fb43a443

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