Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37035b5c401c5b0…

MALICIOUS

PDF

104.9 KB Created: 2021-07-13 05:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e065cb5df44018e8c2a730b5b2ac155 SHA-1: 08b0da4cdeb2d994f0259ecfb3d08927d21a99f0 SHA-256: f37035b5c401c5b0ba0174cf57e82f94ad5e098d5abeb3d7471e2ac77a8048bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://cructi.ru/uplcv?utm_term=bengali+meaning+of+mischief
    • http://reicar.dk/userfiles/file/xipibibu.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a53dda73c---87322839959.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f9742072---mozavanivoxasokes.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25890dec93---97105383594.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/7306695908.pdf
    • http://mwflower.com/upimagesfile///wilezojowa.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/082d1669965f20f32d015a10a22d874d/jiwezexeku.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ght5qdql7n3m6kuge0ld6e08o0/94561204897.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/93c69b00b67386645b1a6b2963aaf10b/lirumadizorefifagagi.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52d57c0fe2---21356757482.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/50bd8e44530335908d362225ad38a924/jopukukaduduzibizidigako.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d5bd80d1---rasimuwor.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/84361587285.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874223b217e---25898872554.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07fb5bb13b---wotelu.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/fopiritefipuku.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef9e33e6b---lisizaserefida.pdf
    • http://divapharma.com/uploaded/file/jogepika.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/74openqn8bot5673d7uae0f8p7/54814524361.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/lb52i95b8nis005dtk37g6c8kb/winoxemonudago.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83a9064d7b---90730558688.pdf
    • http://evohome.pl/userfiles/file/regejanudafukijafufituwu.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568ee5ba92---pebukusigujed.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8r8gu09mj5st93fcddpqbvov2d/rexalawewovevirukuwuviw.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_off00013d47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 16792 bytes
font_01_sfnt_off0001555e.bin
601dc25306ac84526b6b6febeb33fd51507341f0cc423ab46e9101c81f2d74ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1555E 10636 bytes
font_02_sfnt_off00016d80.bin
7eba43d898a353ec46fafea248ffca0b23673d7b797803400c300e0b6887cb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D80 15828 bytes

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