Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7cf9728872267b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 19:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6de8f90da16e5b69b3e907bd1e15065 SHA-1: 2fa2cd411c18e64ec49aae935415e1141b92e0c9 SHA-256: fc7cf9728872267bae47731934d359db68cdd9b0f52eb8cb2a4bba1da2af6e5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.tsahimmongol.com/uploads/images/files/wepasuvoxepamusal.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161319252badcf---zezojatuvebovuposepejak.pdfIn PDF document text
    • https://norservis.com/files/files/28927312630.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/35481230504.pdfIn PDF document text
    • http://packamate.com/userfiles/kefusudati.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b7fba382f94bd4ad197b00b571cc4655/tiwuwowitawog.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/61699729228.pdfIn PDF document text
    • http://imi.vc/upload/files/42411480724.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m2lk59pgtr8a8bn9d9aa1958ij/35246842055.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/60657863286.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/panunizojew.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/kimigodovumedaxabuwubiz.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/15563353296.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f83294c23ad83b81b5a100bab0cc8248/dikikoxo.pdfIn PDF document text
    • http://tochuchoinghi.org/files/98693896446.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c385922ced---misokumelava.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/rixozev.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/pimoxuwalakefatoxur.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/6184773511.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/muwuwoboduvi.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/jomimilatepepugo.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xiweleregibixikomudoma.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/57660001551.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d17eaad33---4373513856.pdfIn PDF document text
    • https://adci.vn/data/upload/file/kapomorazobedab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=i+want+tom+gamePDF link annotation
    • https://lapdonline.org/file/gogevuninaxeraxev.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_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 10080 bytes
SHA-256: c7bbe6f3bd5d5ee7da4582afb1a6ea89b72a1ae6a76ea4e7a79c1497c537151c
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 18508 bytes
SHA-256: b681d003e8509fc50865a8a0b6bbd4c604876f91d12d0559968fe1777b46ddd6
font_02_sfnt_off00012f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1