Malicious PDF — malware analysis report

Static analysis result for SHA-256 31200f3304214862…

MALICIOUS

PDF

62.3 KB Created: 2021-10-02 12:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f87627f646429e32df4c211c1e4b433 SHA-1: 1d98559afc3f0c5a02aa8fa334fa07b035ccb879 SHA-256: 31200f33042148623dafaf0604e682bf0fa7befec0bb37a79b356ab335ddc7a0
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is unreadable, but the presence of multiple external links suggests the primary purpose is to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=list+of+solid+shapes PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142624daf033---85170298130.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c064c3bc39---14216807409.pdfIn PDF document text
    • https://kawanmto.org/contents/files/72147078370.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/pizojadijunoridepefilutuz.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109160228318937.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/60179633016.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/wipisutumiwigiluvala.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/sofajaledaranudagum.pdfIn PDF document text
    • http://cartopack.be/Images/file/74636306614.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/xatogija.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/30840209252.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161367bda52d45---6588847910.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/4996479098.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/josamab.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/45397906204.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/63721676111.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/dosapaluxelixefujojenuxiw.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/41765777399.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/81598861463.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/texen.pdfIn PDF document text
    • http://wdnederland.nl/file/39651131057.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/vekijabinute.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/46963067126.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gumanozibitan.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16184 bytes
SHA-256: 462b11dc0d386670004da14bb9f29837cd70055ad89c8ce3bd5df3a244e46c36

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