Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cabcd0193133df1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 17:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a6fe6e29fc581a87d5081cfc68916389 SHA-1: 31484729091a9cb22deb500aaa61412b580ae07a SHA-256: 9cabcd0193133df18fcbbca37e6a360a3de3f3eb17efaec42eb93de0536e3909
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised or disposable domains. These links form a link farm, suggesting an attempt to distribute malware or conduct phishing by luring users to download content, possibly disguised as a game. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flardochform.se/userfiles/file/ziwased.pdf In PDF document text
    • http://hermandadperdon.es/userfiles/file/jatixaliwugojenotofavurus.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/sasivoga.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/zisisewesusufododazanuxu.pdfIn PDF document text
    • https://makenie.com/upload/files/80240273166.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/rozadofosodidofunarigumev.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/8669170631.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/1873898939.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7g445mia0au7814eafr8fs3mv0/ramapoxomuladobos.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/db3c7aea3f92db342f75a56fd11f46ef/86474590420.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/89346095534.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/soxowuko.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/26735017135.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/8749870634.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/15433258840.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/rutifuseduxumifuses.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1dde48d8787fb8e1b3609cf1334dfdf9/38468286057.pdfIn PDF document text
    • http://webursitet.org/Files/file/malidikotenam.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xizimefiwefobonekavala.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/31398325475.pdfIn PDF document text
    • http://samtle.net/ckupload/files/wifona.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1354f0be---jawubewevupunajulonav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+game+tom+and+jerry+cheesePDF 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_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 19432 bytes
SHA-256: b60ddff33de091f8f0cb2a0fcab9f1607695dd8a7393ac770a6b533ab47277d3
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 11056 bytes
SHA-256: 16c94dc23fcc771439ae38064d44d749c2ab3864a42ee4044ee8841bad791bde
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1