Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18653eb0e475f3a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 06:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1d337730867cbcd75ab7bf4c2f68cb0 SHA-1: 4a82cc2464fa398f972f6f3c0e7954e783b2be86 SHA-256: c18653eb0e475f3ad8d8a32413a5a303ad050283dfdbdc66ff00ba436d36fa0c
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://195exim.com/datas/files/60711627575.pdf In PDF document text
    • http://filtrydokoparek.pl/img/all/kuwaferanijogokasiresiji.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/73851309196.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/30091996231.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/gejadozaxugefatobidobux.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/66613961170.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/zurowodupomuk.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/64988465428.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/tapiwolivasitivokapewit.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614518bf17a1d---68045604364.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/karidukumopepa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff4b269f89---7711387622.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/20300193045.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89956425662.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/52451578930.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/rakipisavimod.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/8086865851.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/90269850858.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3b1f4c8fc6efbf459c6daeec556887a4/32790462698.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/21318128094.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/82a3397935abad77c18cf668195f193e/tisimutitonujepol.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/15758160308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=airtel+data+plan+for+android+phonesPDF 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_off0000b040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB040 15104 bytes
SHA-256: 2566f22709ce2867eb794064d42cdbbddf4d32d3e70b96d7bf109e6396842884
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10576 bytes
SHA-256: 5b781bd65c9a5330b0a1ae1f732c1e29864ac327f9cdfe5b94464bf60786bf64