Malicious PDF — malware analysis report

Static analysis result for SHA-256 8789e7ab44b56c98…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 07:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6851b1ae34a0e0ae6c3618a9d69d6abc SHA-1: 44a2f215a5a22f078d90b7706b1e4b9010d8c033 SHA-256: 8789e7ab44b56c9896c995b76287e02656c3af11eb7f742b7886f44ccf6f8880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable or compromised hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ww150005.linebot.net/upfile/files/20210924071034.pdf
    • https://servauto.fr/img/user/file/23017158235.pdf
    • https://tepihtrava.rs/files/40741931004.pdf
    • http://bctlorraine.org/userfiles/file/88801158012.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/71763356198.pdf
    • http://libertyquad72.fr/userfiles/file/94817756037.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/xumarubotokefajamu.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/84051106730.pdf
    • http://scsychem.com/upload/files/fugonores.pdf
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/golusel.pdf
    • http://cachnhietwin.com/luutru/files/xokirozefomozune.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a63401bb9ff29697878a8e524a7bfd6c/mudekoxabosunivovufemimal.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/580b1be592948b67504f27d0047d8d9a/baban.pdf
    • http://vipacademy.org/userfiles/file/gevejoxesaraged.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/42976391189.pdf
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/13624536565.pdf
    • https://calendarsunrooms.com/userfiles/files/rejoworebevarunumanuz.pdf
    • http://studionegro.net/userfiles/files/jevukeroneturi.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kolopun.pdf
    • https://whiteplacard.com/UserFiles/file/diseresetago.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/98925f7e1774133b7bfd0e046407cea3/nekadawux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+rupaul%27s+drag+race+all+stars+online+free
    • 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_off0000b0fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 16792 bytes
font_01_sfnt_off0000c914.bin
ee5f133cfd54bc1094d001ff7b97eb12b5fdd3c8e2c9119ccc8a0b60d7d210f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 11028 bytes
font_02_sfnt_off0000e284.bin
c735bd98bb9395170393d64a73f0419ef5b3f3fdc13cf25e137e49eacbe27f43
pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 15816 bytes