Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa7724cdf23e2fb…

MALICIOUS

PDF

96.0 KB Created: 2021-09-18 22:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7713358d2969ad6900a89e458c306595 SHA-1: e6230e761617dfd05397007f24c2042b1b273992 SHA-256: 6fa7724cdf23e2fbdbc4146659a212311b6a16d7b7abe184906bd6eee3cdc3cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://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://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_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