Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f4a2c45e33778b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b48799ce0bcded49ab1966dc51c3728 SHA-1: eb9209b7903bac8584c4d67510f529a1b845249c SHA-256: c8f4a2c45e33778bc17ba14346d49d5543e6d59123da867acad48449b3148978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=utorrent+apk+windows+10 PDF link annotation
    • https://newcar-rental.com/uploads/files/202109140637048470.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pepasitovujamiwax.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/dajud.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/13810160830.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3f1ecb555374c4b27437be2efa0d58f6/zeseteto.pdfIn PDF document text
    • http://calisnt.com/uploads/files/rezelojigi.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/27112107182.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/31987106398.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/7053339450.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/winabefigagafosuvuzume.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16141764f047db---duvotuzataromowes.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ee2b5cc---434197963.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/nemepaxafonitijoluxu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/jabif.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/xifibakij.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jawipelaxewusorapufa.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5fb7ed52eaf10d3d3a96d8fb9e739df3/ladatijoludexu.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/modarumonobofisujude.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/66914987721.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/5996273685.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/vexesusagasof.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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10696 bytes
SHA-256: e9df9627d76c7c78f29e9f85fbf70b59807edefca7ce67d0fc47bf9b6fbda1be
font_02_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 17632 bytes
SHA-256: f5a1709b111fff263a2172b347cc1578d2b0c0ac518cd2ded153b5a364aa828f