Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e7957654c7d1bc…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 09:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ede622da40cf3d1a2ea99dfc6a4baea0 SHA-1: a51b7f4634f547aa0fa47c851af6df0e491c04be SHA-256: 26e7957654c7d1bc6f0646c8e09619e2183c48f10dc9b07af92941b3ac346239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alusol-kw.com/ckfinder/userfiles/files/jobazezer.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136093b38072---menitemosorezibegelirasu.pdfIn PDF document text
    • https://alev.az/userfiles/file/9351870693.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/feramixipaboj.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/wowuzimarubo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210907/file/12264859424.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402e685fabb---29458657018.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/11951829487.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/72554309015.pdfIn PDF document text
    • http://esen.life/userfiles/file/susegite.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/waluvore.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441a938eeac---kujalerel.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/92962364993.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/woripatogaxuxifewabo.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210917080817_540841802.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/baganiverufadomomotut.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wavuwujigiwidovebabi.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/paxasadutilodo.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/98616869571.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/faxaliwikelibivejetir.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/57776166515.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/lugadotolakefomupi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/062cc12a9fac3a6fad43dbb5e2ea1237/xetoraxaxejilovoxojezeso.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/zikek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=zee+tv+app+download+for+pcPDF link annotation
    • 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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 10468 bytes
SHA-256: 4afa359fae41d1573f492ebf04bbcfa913736e6a9ef282789281a552ac9b7f5e
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 17600 bytes
SHA-256: 8757fa29d9790984fafb7d82249f3ca63b290f92b3899dc96952c11730cb7ba8
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1