Malicious PDF — malware analysis report

Static analysis result for SHA-256 deaa066409db1707…

MALICIOUS

PDF

89.9 KB Created: 2021-06-18 10:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb4b990097cbb47bbb47155c42a99cd SHA-1: 48c68ba83c1270786f946747ddfe256b4f728425 SHA-256: deaa066409db17076b60f5db7aa59de26338ad1f1cc902eb164ef5885ded44b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928f1eb07ed---vudujumixen.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2a82f03578db5992881006e0034e9eb3/66680694941.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b396478e---zojitematubaxikofapovit.pdf
    • http://aihyang.com/userfiles/file/fipixutikale.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/efuodsj3b7013pr6m9v6ah0qsh/25806655118.pdf
    • https://alice-immo.com/userfiles/file/sunipuvaruxofakuxudij.pdf
    • http://cnc-soustruzeni.cz/files/file/80117143307.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608567202c380---69448862213.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b81ed02f---19843587746.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074259fdbc24---filagugudewib.pdf
    • http://fygl.net/uploads/file/15000753359.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a486a64f---gemisonojofolisivanoz.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ea26e6cc---ronagapibudodedewun.pdf
    • https://a2designbg.com/userfiles/file/27727234236.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9340cb2549700d1f4c73f008111cbf41/dopaxivasiwovidi.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/da75b7814396a9acf03bb6d8f449e1fb/23713762334.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc109c0ee2---womozafuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nfc+card+reader+pro+apk
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef76.bin
ae5b78f89791446a7039dbfbf96f292d8f00f34ee85219c165555dbb117158ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5444 bytes
font_01_sfnt_off00010283.bin
6e41ededae6917a58d072b6bcc3b2a0129c009ab5422d8b370060229563c46fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 4972 bytes
font_02_sfnt_off00011385.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 1800 bytes
font_03_sfnt_off00011c15.bin
f8fecf57a71f44d9cb4e5e97c7486a81b7658a8388da2211212dedb67682f6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 11692 bytes
font_04_sfnt_off000143b2.bin
93e16c563d28daa1ac97c0fd85ef771b38878b2d08f52383495748026440cf21
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B2 16204 bytes