Malicious PDF — malware analysis report

Static analysis result for SHA-256 e737caa38754c8e8…

MALICIOUS

PDF

97.1 KB Created: 2021-07-05 21:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b2263d988d526c8e1d130935f7ec82d SHA-1: ae6e7113c03cafcb266a293e5c32c5ce094ed020 SHA-256: e737caa38754c8e8cd71d1adca8a0092cb4ec108e8185083be89d77b74ae7427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 hosted on compromised CMS uploads, with numerous distinct hosts and UTM term redirectors. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/808417429c62d0c4f25c7d6983199727/bikil.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210603_061127.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/35528679808.pdf
    • https://10glazsikeyrosa.ru/file/bebijededi.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ff318f28da3cf4ddff2d5b84ab374c12/mipusuwuzakapinutawev.pdf
    • http://lumieretvie.com/userfiles/file/6627708988.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867fe346c8---xogiwetaxevimoz.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69969c78e---defujorogani.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/660iv9megtlmuvrt8t263j9koe/57885610097.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ee605426---danemotulakirufatarob.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/dobifavidafafejulotuvupes.pdf
    • https://healthmatters.me/userfiles/file/sulakuzogupamisisoge.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/53897177964.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b42bf99feb1---67032761612.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/184ba02700946d800de885bc233bc130/vaxezagexo.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vt4pfmkl6s19s0jslmt021eegf/26932973376.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pvv9e02625f8qq72phgtqvrfof/juwotobajapegodilogir.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ad4ab4742d60cd044272aa2dbef83ff3/nozoxidebafoba.pdf
    • https://cicadit.ro/UserFiles/file/29918450040.pdf
    • https://knjizara-harfa.rs/files/70591712290.pdf
    • http://technoculture.cz/admin/upload/file/mifidurafexefesur.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5c7224bab9ff9dc92655b01ea5775f9/76422128577.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dde6332b2---zumefaguribep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+image+as+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f942.bin
bb379d28f765c4ebf1f4e04c5dfbc3cf389ce60e0bc4df7cfbbe1685c41ee7b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 11060 bytes
font_01_sfnt_off000112d2.bin
e2c28578686ae0d1ee5cfcb6ad896f74d0ff579a7c3e52141b31c6e384bed69c
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 17656 bytes
font_02_sfnt_off000140de.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 16140 bytes
font_03_sfnt_off0001565a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1565A 16792 bytes
font_04_sfnt_off00016e67.bin
57a73d877970e419005db3c38d676d43bf95a4071fcadb27eca2cd578d21aea2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E67 1684 bytes