Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c05dfc45343b71…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 01:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a727034f982384cd5e3a23e9f3c58d77 SHA-1: ffa387bf8bc71205fc067159ad43a4bdb7ff70c4 SHA-256: 41c05dfc45343b71c408e8b164fae89ae7848663b16c728840fa19c8cff0176e
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate the PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vamaconsulting.sk/userfiles/file/ragasuterafo.pdf
    • https://borgopitti.it/userfiles/file/jusobomob.pdf
    • http://artstudiodesign.it/userfiles/files/86448481717.pdf
    • http://akwarella.pl/user_uploads/file/zaloguzewomixorevasese.pdf
    • https://tpk-m.ru/files/file/megelovuxife.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/91010531840.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3b662ee---87937725981.pdf
    • http://champaigncursillo.com/userfiles/file/60616812790.pdf
    • http://alexlunacoach.com/img/editor/file/barububevizagusenax.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9c3c691b8bcea6849fbd504c5137fe1/69029007041.pdf
    • https://kaptenhoki.net/contents/files/jogarorafizuvipolowo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b1901ceb---fofutep.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/wejarugatub.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144c1d7d1206---gofoluwisan.pdf
    • https://portalbime.com/UploadedFiles/New/file/wepogugituwakuvivil.pdf
    • http://artpolyclinic.com/file/files/pazexosikekavoxixaxovik.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133192eca51b---fidegawuvotasekose.pdf
    • http://baoveantam.org/upload/files/vugelezajal.pdf
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/woxisajudirozeg.pdf
    • http://americandeliorder.com/uploads/files/paredisakamumisavamarex.pdf
    • http://hoachattn.com/image/files/nereluvuliroruga.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/36223951549.pdf
    • https://media-get.com/userfiles/files/ronalugi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=google+maps+per+android+offline
    • 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_off0000d6fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 16792 bytes
font_01_sfnt_off0000ef15.bin
d5aae0635771dbd605f1fbdaec66e3f297ebb0e632306e809fa781b58ec16709
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10784 bytes
font_02_sfnt_off000107a5.bin
737b7238fd6ba970abcee71af0f73b617ed0b356762ca2b9b8c9d04b92fe8e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 16796 bytes