Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3c5e1855513355…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 06:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54e483a44ae584c71a7d11c677ab9579 SHA-1: 7e2a5ea12fed32379579206881cf2c5514c328c5 SHA-256: ab3c5e1855513355a959a68da48d20ad0e24ae75b82e1e3990585ac4906081e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm structure, indicating an attempt to redirect users to external sites. The presence of embedded JavaScript and a high ML classifier score further support malicious intent. The ClamAV detection as Pdf.Phishing.Trojan confirms its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://1000families.eu/userfiles/file/rosix.pdf
    • http://ingpiazza.eu/userfiles/files/fupolitezagi.pdf
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/78972592933.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b40deebfe---ziwidaxenugulepivuv.pdf
    • http://tylincms.com/userfiles/files/bitireviso.pdf
    • https://ylwlgwadmin.ylwl.cn/upload/files/92294455149.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/degawikobuvimivopisefa.pdf
    • http://didula.ru/img/file/ganewa.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/belupe.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416d0f435e4---62129955828.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bozikinozuv.pdf
    • http://abwferrellpkwy.com/uploads/files/nuwezowolirijebowav.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/96995449953.pdf
    • https://fluffy-chins.com/images/file/vijemonoruwivutagi.pdf
    • https://ltes2.tw-goods.com/UserFiles/files/41061554468.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/mizefodol.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613740f7407f7---69609134558.pdf
    • http://zbigniewrodak.pl/galeria/file/suwerejuluparuvuzo.pdf
    • http://magdrywall.com/project-new/christianbook/upload_images/file/307905981.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7802cd4b---37439825666.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161387fb8380a9---35368489838.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/57930277882.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ddfc926e63b2c16b68d42e4b62d6a1a4/53439545406.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbfbe673eb---bumegotodipefunet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=azee+photo+editor
    • 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_off0000d4dd.bin
44a18fb4aca65c6a1b19a0d33b1cbc89582b4d71237cee79474c08b0d89d8bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 17860 bytes
font_01_sfnt_off0001036b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
font_02_sfnt_off00011b82.bin
1e6ce9d2d89307a0a5817a415f2623e2816fd4c4084b97fdce1e720b1e8b0a57
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 10052 bytes