Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39338d06745eb04…

MALICIOUS

PDF

101.0 KB Created: 2021-09-19 06:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2a0679aa8ed4c7342c16ef52781f9341 SHA-1: 94f334a5ec5bacded5ee2399b13be9ff0194f63f SHA-256: c39338d06745eb04cf3218ba5b36682057510e1c365034164613a0ad087c6b89
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 CMS upload storage or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://davidhammerstein.org/userfiles/file/11949836237.pdf In PDF document text
    • https://safe-international.com/userfiles/file/24076140862.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/55443229552.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/topiropokodalo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rirukigurotem.pdfIn PDF document text
    • http://symbolfoods.com/files/file///xewamukasakanetaxum.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3adac7924b6fd3f7fb7a3cbdca14f6a4/51611671858.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/xefakudugemomozokeg.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/28dcbdfe228d15fdba06f00158613c92/gijigefivoxuvoxo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430644ce13e---nexemodadefumuxixufalowi.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1429584285613ebc2e2adfe.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/12320638970.pdfIn PDF document text
    • https://kultmotor.hu/images/files/37065682783.pdfIn PDF document text
    • http://msiutilities.biz/documents/lanedefebew.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/saketirazesofemu.pdfIn PDF document text
    • http://farmina.ru/uploads/files/67617454532.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/ranov.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/juvenume.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/puvokokiditosozidez.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/62786745951.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/xarifoluvexofizimigu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nilorenedazidazi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614546105c627---60090971538.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/majatiwulewovibonizer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=opengl+es+4.0PDF 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_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 21500 bytes
SHA-256: bd29bf3ad76e5db2e7530c96d2565b7e3b97916f44951ef202e305efaed5442f
font_01_sfnt_off00015677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15677 10148 bytes
SHA-256: 2a51c02ddc07adf3178e09cfe36f197e76a5e8267697c5253cc1fe2b35926493
font_02_sfnt_off00016d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1