Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e8728fe74548fb…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 02:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5f7dda1aa16619c4de9a085a50c98ab SHA-1: d382a6f5ce98894d595d4324b239c67f084f69a1 SHA-256: f3e8728fe74548fb02fa9777935c52c40a40bd6c0c9918823793cb55336c6a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains embedded JavaScript and functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=is+carrot+vegetable PDF link annotation
    • http://gurolmumcu.com/userfiles/file/2981426952.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/ledegatamipuzakixaliwa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474f0997987---nuzaremaxotiwepefak.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/2882921187.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/bemarak.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2f5pcbcs02od1ncp2b3mblkb65/mebusoxidisidotizufik.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/sazinev.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/79279777076.pdfIn PDF document text
    • https://777mto.net/contents/files/73330358886.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/22481345101.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/57559924809.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/situjuzifodunegiluvofuw.pdfIn PDF document text
    • http://houselandia.ru/files/vidaxigemedalufemonibuvo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/8962006507.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/83440151977.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/wapaxi.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/5545878760.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142384cbd6d0---gebufasatiboj.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109120948193553.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/fifobeberet.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9ve3184nsfr5ojnmlvnbgn8vo2/78841154870.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330f8becc4a---65733414662.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/84450537318.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/rekow.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_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 17192 bytes
SHA-256: 63a8bd0267f60efe5ce7b147d9a44f9432f674e2eb6ef3018db4acdacf64a952
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13370 10368 bytes
SHA-256: 872f0c98cf483543c47bd3c97f98aaff2676626bc393cb890e133b43579f7607

Open this report in the interactive analyzer, or submit your own file for analysis.