Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ee5f8daf6e5dd3…

MALICIOUS

PDF

78.0 KB Created: 2021-10-06 12:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b44037cc725e60d656df8a2f59fc915 SHA-1: 1e38964acf6e16305f8773e89f3efaba640d46d2 SHA-256: d6ee5f8daf6e5dd394d9039137bc523a4b579f228100f87834970dbba6b06152
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://infrive.ru/uplcv?utm_term=consequences+of+polypharmacy
    • http://kcpsystem.com/userData/board/file/24267894552.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5712da7f1b7494a89545eb46425c3bfd/lafevelazelajidizijitoje.pdf
    • http://cafehinglung.com/uploads/files/80257192280.pdf
    • https://eseninternational.com/uploads/files/24206534471.pdf
    • https://aonetreks.com/uploads/file/27553139504.pdf
    • http://wisdomtours.net/upload/file/88452297949.pdf
    • http://citadelcaralarms.com/userfiles/file/paregagowa.pdf
    • https://baruipur.org/ckfinder/userfiles/files/todegifu.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/71186812668.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/tufilolokuramumataf.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ae5f3d9e07dc095053642520e2bafe79/35581651868.pdf
    • http://bjsddesign.com/filespath/files/20211001155542.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d353a899c3---wenebebafoxewasalimo.pdf
    • http://vector-mebel.ru/uploads/files/xibisona.pdf
    • https://igk-lilienthal.de/downloads/supikonemawemoxalad.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/bolazopadexo.pdf
    • https://micsys.in/userfiles/file/sugajavelutuve.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/35072562939.pdf
    • http://fasson.vip/images/editor/files/pekoxakozafud.pdf
    • http://flynewsletter.com/uploads/file/23633880747.pdf
    • https://diamond-marketing.cz/soubory/89470813047.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161372acdcf70b---lafubikiseko.pdf
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/98201594561.pdf
    • http://iknow.pl/files/file/tedulamuwegomixujobesu.pdf
    • 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_off0000c954.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC954 16792 bytes
font_01_sfnt_off0000e16b.bin
f8802aafe8bd5c12f24599362f88cff436d8d8508561cf49e526726893a6f9ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 10948 bytes
font_02_sfnt_off0000faa5.bin
4c51fc2d04e47be55e5789ba60cbd02ffa6d1dd61ec6179446716075297c3174
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 18792 bytes