Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b01ae56860fc7de…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 11:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81229964b89e4d2a3b739099f5492966 SHA-1: bfc303216d35427594c55918c1f8d4c377ae0835 SHA-256: 5b01ae56860fc7de57fb22f549a0027ca7d2eedfd7b80ea3cbcadd6a8d511b79
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. This behavior is indicative of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7560

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 http://www.alfapilates.pl/upload/file/kudesewanesivav.pdf In PDF document text
    • http://aygroupmuh.com/image/files/20843665016.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2494722e4da7d16d70fc381ab2114f80/fasakubalo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/88d5dbb434dcbbf275c4623e7124437e/9627860098.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/jobimuwetukepajebefiro.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23b5fa423c---91177072201.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pabavokokoligorelireg.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/77014062376.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/2770532206.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xeboli.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/57029147863.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba7005e50---89775321616.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/99231268846.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/nejafoge.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/sunixexovagiriki.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca7abdeb---48991595271.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80796669181.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/lijaviwekiwizamig.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zigaxerovukefut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077620480641---24039928978.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/xedubamevuxapotutena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=appendicitis+etiology+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 17996 bytes
SHA-256: 8582f97ba5f5fee0df5543c00061096d3c3dad6d41310393281aab1a6c279053

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