Malicious PDF — malware analysis report

Static analysis result for SHA-256 587c8936e9b97cc0…

MALICIOUS

PDF

99.1 KB Created: 2021-07-05 09:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ac19a602d7a1db4480c4ff638c6d60a SHA-1: 879c5e128799ba7ab56ba7fa75ae68c19966a042 SHA-256: 587c8936e9b97cc0e00d0491f636a796c6482674e2c3d73d7172b95a3f59c3c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://pistant.ru/uplcv?utm_term=best+places+in+bulgaria PDF link annotation
    • http://goldartline.ua/userfiles/file/tifejefowisusakegiki.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4172bbc2f---87949721799.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/53805601491.pdfIn PDF document text
    • https://areicon.com/images/file/69516430296.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/55q05gc27o7j4tp17l1o0mdpbj/17908628238.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/97280926211.pdfIn PDF document text
    • http://vizcsap.hu/files/file/13999276444.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/f2ngg84nv7a569juuc442g1iie/gajebawefudejikogewan.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5dfb8171c04acce4fc6db4d95d63d7dd/nelekamimitajarividuzabej.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/wutujuwavapekajuludelul.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/jofesutepoxobolivojerof.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8b446efde902352b5494944b9f2db3b3/majur.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdca582b7---tefulezur.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f82dab932f4de0d5295e67f518b7c74d/18944396240.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6322ba5cc5df2db33c90121b374de468/tapilagafevuxilegofove.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf6391369---62793566802.pdfIn PDF document text
    • https://chp-travel.ir/data/file/masumexatarinixifatebusa.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20471289510.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867c001729f---11940009888.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/rozokogane.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/aa56030acdb9b9ed8975ce82ecbab73e/96202065171.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20df66d03---batobeja.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/danamise.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/84527869970.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 10724 bytes
SHA-256: dbd3ec518d151d444edab72efc30f5f5cb7182ee917ea43ca99b6165671a6ce9
font_01_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F69 17728 bytes
SHA-256: d16a5ba260534861b4451d712c6e5085c35e4ae13d810364c2dc13fef098e9d9

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