Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf5d4e965a2ccb1…

MALICIOUS

PDF

86.8 KB Created: 2021-08-15 18:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f63cfd98635ff76ab0a0b014277b7721 SHA-1: 8eb8d968efc40571187f9df3774350ae387815a1 SHA-256: bcf5d4e965a2ccb174dcb7f8a8816c745e3aec8b6254588eccfbff9e49356220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b611f97cd1c---38706681325.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca0c21bc8---lulefa.pdf
    • https://ecoledesgourmets.com/userfiles/file/kamalof.pdf
    • https://vicotelecom.vn/static/source/images/file/zerej.pdf
    • http://tscyw.net/userfiles/file/20210805232236_gsut90.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b76975056---buwowesapenatapasit.pdf
    • http://dush-kz.ru/uploads/fck/file/vilizijuzarumukat.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/49655585942.pdf
    • http://teresachild.com/upload/files/digufezumibidijakakemude.pdf
    • http://anandtouristcorporation.com/uploads/vivobedimobaxarovujor.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f69cd7bc8---pinirebuwumanet.pdf
    • http://ck-kutnahora.cz/gais/image/file/zunilepaxuvi.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c434c8803cb---pasem.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58180260b5---41816488847.pdf
    • http://masan315.net/board/imagefile/file/56211950005.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/83691640633.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/75b2c007ded1311a37dedb0bec22bd0f/fajopezefege.pdf
    • http://jucal.es/images/file/37912625857.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b8892fe---22773311470.pdf
    • http://a-kamen.com/userfiles/file/73568695089.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/zudorikexedezamowidajuw.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0e60daa6---bikudizu.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/89053945188.pdf
    • http://train-in-japan.com/images/blog//file/94405860244.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/298755bfa9eaa5a35ea60b5e3a9378a5/51208732128.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ciencia+e+ingenieria+de+los+materiales+donald+askeland+7ma+edicion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
font_01_sfnt_off000101b5.bin
47aa001d61425a681826bf0831e56b58095c996f45ef75ab6d09bd51d3825a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10888 bytes
font_02_sfnt_off00011abd.bin
a89d6185e950074c15de84b0d3bc0007301622dde160d5568d5c9b71ccb76852
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 18588 bytes