Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb068df5068508c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 23:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ac9b00a0be016fa08712d36c410da6 SHA-1: 880426b7417d7bf379602e5c30c0c430652efe2e SHA-256: 2fb068df5068508c1178411dae5721b675842ad78c0a97403714190b10be68ac
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=mxq+pro+4k+install+linux
    • http://vegman-kzn.com/ckfinder/userfiles/files/28605857616.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1ea72948c9187eeb4797bb9022e4397/nafitawawelesugujase.pdf
    • https://akvanova.ru/sites/default/files/dokewatupezitavisubive.pdf
    • http://xindeshiye.com/uploadfile/file///2021090603494330.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/30922798635.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b6d7da58a7c6e6b5ae50578caac00fab/wanakutatuxubekikila.pdf
    • http://koszyczarek.pl/userfiles/file/90402520614.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65377be77---53093957799.pdf
    • https://kaptenhoki.net/contents/files/15569213860.pdf
    • https://pima-alarms.eu/slicice/file/borudodotijijusojusax.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613de45cdecd8---13129185002.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/77274a1494f555559a906733b96e80ce/jerozefodetut.pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/dimenuwa.pdf
    • http://fabriziocar.it/userfiles/files/nopado.pdf
    • https://agrimal.pl/userfiles/file/75794489768.pdf
    • http://turksebruiloften.nl/userfiles/file/66753668406.pdf
    • http://zabradli-znerezu.cz/userfiles/file/valuwunudojigi.pdf
    • https://ngusacdon.com/upload/files/80216913812.pdf
    • https://inprovituruguay.com/ckfinder/userfiles/files/dudep.pdf
    • http://thietbianninh188.com/uploads/files/26314184832.pdf
    • http://schokozentrale.de/idata/nimafizewegisulexuzus.pdf
    • http://mxqproject.c
    • 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_off0000dc87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 16792 bytes
font_01_sfnt_off0000f499.bin
25f54decb99236efdc25826d2911c07f3a58891477f4d5cd073feb589868947d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 17680 bytes
font_02_sfnt_off000122bd.bin
01be0d0217e6a495232e8911fd6ef59be5a7f6f08e008d28776e465dc3fb5049
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 10624 bytes