Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeac76f909848ff…

MALICIOUS

PDF

68.4 KB Created: 2021-09-04 11:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34b886dde88f78fa49a636bfd5c4184a SHA-1: 81405389bd5b94dbd621018e2f833cab94c781c9 SHA-256: cfeac76f909848ffad5253ae848a6b241b0ef8010b4f9a11322a120237b12eef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with embedded links to external URLs. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a delivery mechanism for further-stage threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=vision+in+arthropods+pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098390de04a5---logexosobevonanarowogafo.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b251fc8c99e9a5c4f5ef50ac2b58c691/13677604309.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ccecbb2d---7474563014.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868439d875d---63281934108.pdf
    • http://sergey-yushkov.com/pict/file/jepabilizevudubilaval.pdf
    • http://kolaykanal.com/userfiles/files/15056394946.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9f55c3e9---rugagime.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/bf14bf8f84ee50108d7cb60db2f0622f/wiwufenijavotu.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72150674626.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904d809d987---datinukuzarenamukak.pdf
    • http://www.samuitns.com/image/upload/File/lumevatijizered.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac320e585c4---49959996899.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc444d85b21---93884720025.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5b83f04a---59081866115.pdf
    • http://studiotecnicoprato.eu/userfiles/files/tuwumo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5dqp429kfsh69jrk2omsq9lghj/49015431461.pdf
    • http://agt.es/files/galeria2/files/wigiwuxotagofoforaxof.pdf
    • https://lwim-ouargla.dz/ar/files/93102244223.pdf
    • http://otoozevran.com/resimler/files/59256529058.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3000e6970e---6899661996.pdf
    • http://www.peretprod.ro/content-images/file/lulebubajemetutaseribiz.pdf
    • https://najarshi.com/basefile/najarshicom/files/dikivuziditud.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607118504507a---92935296177.pdf
    • http://ps-chiptuning.hu/userfiles/files/53925159181.pdf
    • 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_off0000b245.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 16792 bytes
font_01_sfnt_off0000ca57.bin
6061445dd4a55387f47965eeed938c82374fb5542c16c68aa6d785ff880ec459
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 14132 bytes
font_02_sfnt_off0000ece4.bin
a672905485d14c32864044d0166ef76adbcc2ba2b3681179170c568dea09ab4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10388 bytes