Malicious PDF — malware analysis report

Static analysis result for SHA-256 210a5d6c16aa4a96…

MALICIOUS

PDF

60.8 KB Created: 2021-09-27 15:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27c10d69092d977513771a0400110755 SHA-1: fd5391c2e845ecf2ed321a5cc14f02d9948d5255 SHA-256: 210a5d6c16aa4a9610d35e051fc6496fe3cc28d93d1d18117474a08cb45db921
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4569

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://oniceh.ru/uplcv?utm_term=android+cardview+with+image+and+text+example PDF link annotation
    • http://fujiya-burbank.com/uploads/files/19304994347.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/vuwizu.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/4958784510.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/40043770857.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615185b5b3c91---7886110160.pdfIn PDF document text
    • http://acelybio.com/upload/files/63997425500.pdfIn PDF document text
    • https://rotitelor.com/contents/files/xipizeguxu.pdfIn PDF document text
    • http://zenkatsu.dk/files/wiwaxiwan.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1a2aed649---92388362234.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/63636196346.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/fovanujilodizenalej.pdfIn PDF document text
    • http://xn-----6kcftbqgtghjv5bf5gydg7b.xn--p1ai/files/files/piwojakanojapilozizukotog.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/964797388.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudusapoku.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/roxurudivoxifudakuso.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/3ve923b864d80aoqo2ha005rhc/20348931332.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bjnkcbiehadhimi6tfo1669snv/16571480519.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/rikiwikemexexex.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gevegojosakunezapasariro.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/mulumolirumofegokiloleno.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/61959970849.pdfIn PDF document text
    • https://nomortiga.com/contents/files/90023763669.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/54029528951.pdfIn PDF document text
    • https://5uempat.com/contents/files/nilikitavavilusizodivufeb.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/95766648383.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/37735814388.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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 11028 bytes
SHA-256: e106ef6dae6df5b0c17c032589a027183f831940245f70de832308e992f4e6d3