Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f7a8085edb7756…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 16:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cab4c13fecf703a341346b191415ed8b SHA-1: ac57f06e3fa6b326658ff42cbace55684ff9ce15 SHA-256: 64f7a8085edb77564be90819fd2273429f51249e3e754efec191cc55025b326e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sumbulefendiegitimvakfi.com/resimler/files/vedamodidurif.pdf In PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/vufovadu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/49886526824.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/merupin.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/6018948977.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/bodinefule.pdfIn PDF document text
    • http://jarosi.hu/files/file/fuvivavexusafijoti.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/75344764129.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/92659274915.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451d89dcdad---jagarigaxijuvaxanugew.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/43671985062.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bf64d959a77c253ad57af6ac16af259e/zufinetelilalud.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132101a05604---19025295573.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/36635144474.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/84220796224.pdfIn PDF document text
    • https://tekartltd.com/upload/files/vuxawatosapoxukasupedapa.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/jameralaluvoxejep.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5f003d9feaa66f3964232fedc13caf88/revonugubakobajugeviwo.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/88097081486.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/nupud.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/pavomevogozolaniwu.pdfIn PDF document text
    • http://egitara.com/upfiles/files/nilatixefe.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/tumusasu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/45178302265.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/76996614581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bermain+game+java+di+androidPDF 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_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 17616 bytes
SHA-256: 59641bb425748830073416eda536a91404aa8b8e287cf40bb57c617d26be7434
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 10528 bytes
SHA-256: c60f01ca931f45060e9b9bcb2fc8be07e0bbb6a788bf9a81280a6c3974635688

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