Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26862dd3ae03a01…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22f7856f28138e83793c71dee5f7cda2 SHA-1: 8adbe32acdcb08664a5df38c20f87a21e2e06f60 SHA-256: f26862dd3ae03a0102ecac96fcfe3cb23ecf6059f774e20b1c91c1123d27c891
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the presence of multiple external URIs and compromised CMS upload links strongly suggests an intent to exploit user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pixomot.ru/uplcv?utm_term=seed+crafting+and+building PDF link annotation
    • http://5thaveseniors.org/userfiles/file/87024372763.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b8f5ddb0cf1e877586df15e86ced68d/vonipov.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/23989d0109589b34cc6ef56a060ef069/giligupikuvajikomifib.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981cb6f47b---27756580767.pdfIn PDF document text
    • https://susta.vn/userfiles/file/banagufop.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9644518910---xajalebanazebalejelafug.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/nipep.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/bozawubipenowug.pdfIn PDF document text
    • https://medtek.vn/storage/file/23722302734.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/35570434373.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e5057bd62---duvituwolizumumuzebelib.pdfIn PDF document text
    • http://computerdoki.hu/user/file/lavikedozib.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2e92adcf---9773171663.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/43966814340.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/a3burtrdnd97mq20lj073augtf/84041866795.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080126513190---wetewolujexefakasiwi.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/71926942522.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc46682e7---kobifokofetesofuposazo.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/51849487028.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608283d6879b4---77478149949.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qokp2u1lp6kqp690c6elir24c4/75686130062.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74921c8336---95372442852.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e327554f68---dikuzoronir.pdfIn PDF document text
    • 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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 17464 bytes
SHA-256: 8f4ed5c7dbef2a00950d1d1de3e6dfb0333c8e058688e259accb9abf26bd1350
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10680 bytes
SHA-256: 0a23398f7e5a06a6c00486a7189182f12db147cc3ea62cee77387446ae1a3858

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