Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66d9502ebb32138…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 22:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 13f9e146af632574a5ab950413de6dfe SHA-1: b23a2cb49963598835c98c32df7c2a8567d11a5f SHA-256: e66d9502ebb32138c00fe73cc78508f6c2d92aaaa889eb89961a6b3d460c0ae4
124 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised websites or disposable hosting. The ClamAV heuristic identifies it as a phishing trojan, and the presence of numerous links suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3685

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://pixomot.ru/uplcv?utm_term=blush+modern+family+home+bloxburg PDF link annotation
    • http://maraulsan.com/ckfinder/userfiles/files/xotaradirijadosuv.pdfIn PDF document text
    • https://cet.sk/res/file/sumame.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/92450393349.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/94510381505.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/46509286704.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/91428293935.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bolesemidor.pdfIn PDF document text
    • http://medi-sen.com/files/files/56017219446.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65a922e0872ca5675a8724f49c5efe67/3081157025.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/riwebifodasutavuduxu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/61593217505.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/59750603645.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/85530568908.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/13465704362.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/03344fd6573f909a8d4eceb613dce4df/4278277787.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/zosokasuwete.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/suxepusakujukukixegu.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/99044267263.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zamovixakuviwa.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/29931335141.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a6f1d037---tuvigojija.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/31518142872.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/50369160303.pdfIn 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_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 17644 bytes
SHA-256: 6d885302fbcec875d94cfbc69fda03fa13dd6c49a2e66749fa9716ff76035f65
font_02_sfnt_off00015792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15792 11212 bytes
SHA-256: d0b439c920ca52be54cb5688d1ef7342a1b39b710cdeecf2dcb8619a48a1610b

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