Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee01a3d659428842…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 14:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: effe2b0b2c1652dfcac5c14ab43e5048 SHA-1: 3307adf8b15f7beda9824655f18308b20a53ce31 SHA-256: ee01a3d6594288424a281ec47a9e3023f1416e506a449bdbf02a4b929895afa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing pages. The presence of these links and the detection results strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a15686e62---kupejitedejom.pdf
    • http://artospace.com/pics/file/xonaxubavovojulisuxur.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/70d04623a1899d623896d1819f87bc13/86284493118.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/35794a73e608b9def94ffc77a5de8f19/wilevujesawiwalibof.pdf
    • https://hkparkkonutlari.com/image/files/33727620006.pdf
    • http://alrehabourhome.com/userfiles/files/87064449237.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/af04i6fbnm0de9q3bh07uvd6s2/vewadelebowisi.pdf
    • http://natproperty.com/userfiles/files/zurawozono.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9b339f9d5---mavugiwijo.pdf
    • https://ratsimae.eemedia/contents/file/doporemikonoziroganekexe.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ae8cbcee---35185199474.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608479f990891---lonilatafiduboket.pdf
    • https://bedandbreakfastchia.it/userfiles/file/28314043695.pdf
    • http://cellesekorea.com/ckupload/files/23361444409.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=4+letter+words+starting+with+ma
    • 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_off0000e5f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 16792 bytes
font_01_sfnt_off0000fe02.bin
e535efe0e25251d925cb868add9eb99fa5c1336eb14d87ea2cfd23dac14cdcc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 17340 bytes
font_02_sfnt_off00012b6e.bin
4ec0d069d7d148ef5a22d75d97dd490ba2e60e8e2f4db0c2ad4eb4fa4259c773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 10760 bytes

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