Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea33d861f885aa0a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 22:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6620d29966d1dbff5f264737212961e3 SHA-1: 0a93236737ad53e6fd2aa05e88d8266f0c4bfd13 SHA-256: ea33d861f885aa0a89066215877b4d8a5e29fc49d354d0268095daed2b3830d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple links to potentially malicious sites is a high-confidence indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=pain+in+thigh+above+knee PDF link annotation
    • http://lumieretvie.com/userfiles/file/dogelujosuworozepufexojij.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/aaffeed9f5025ad001eab959ed4ceaaf/87403581881.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xegaziwisededimukiteme.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/683f7654e972ae04a4aaaf34c5e67928/suxagogemizaxexadaki.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608798fc6997f---79491663071.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/96905862205.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce4a49c12---vefokejosaruto.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/97695102106.pdfIn PDF document text
    • http://fitviewer.biz/files/file/64061327429.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/90369971128.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bee8b6b1f---42991597045.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e6399dda0---53544079500.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/211144569933.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2943bu5t6hihpvamnrhv35bra7/jipefumu.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/bisorakoxekipatexat.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/58531436249.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905760b104---tokadulivowubak.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qbahun5rf4d8007pdqaqfptrsd/zorekebadarewexakoruwono.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/peterobivivid.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/j1690u5lqn7lqkqg636lsoj5if/13180940408.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/kofuxemilufi.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/7061244925.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4e8def7d6ce364d9801a88d1a33a8d75/97726849694.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/86664719092.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/83908185973.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16828 bytes
SHA-256: 95c45588140af19a036abc844fb885b4ac7f352e62ea139d36ff84ab2a1f5958
font_01_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 10372 bytes
SHA-256: 1cae2144b191a1ac03ed31595e6008b69f31649b6e81c67576f7b5bb8ba46c97

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