Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea4c8f4dd6d442c…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 23:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccd9e626e5581a15f76444b5faf55b30 SHA-1: 6c750d584d4a162fe3ec1bf3e3ba5ddd0e72ca94 SHA-256: 8ea4c8f4dd6d442cbd776e1b25d0798cec3d7e7d831906ae7c9e69030b1073b6
156 Risk Score

Malware Insights

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

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 pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple external URIs and the nature of the detected heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e46520c6bfc36131472947289e81886/12293199059.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/eec0ae3214c9f8f3ecd59fb954c4dedf/zarivepitagaxibeboxogi.pdf
    • http://vivatbacchus.hu/files/file/74508145734.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxofotexewilajefijowulu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7aa29cc95---bugatemepadudus.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/manozipewamejogero.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1hkql8gbvh0fa3p0k7mdr8c383/moponojoluralirupipi.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c1fcb9b31---12742573037.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/935646b3c055253d16d07e785b746d5b/75527743163.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc1ea9c0d---83366650324.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/b5bea263684f605873fbae084f7a0350/11434821031.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/8790372036.pdf
    • https://actor-conseil.com/files/file/xibunojebakokalabutefujok.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565943a565---filixokagokut.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/df372a089728a9ad0710f8f5c3ed95ce/27399297179.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6c898ecfb3dcbfaa088646a2f435244b/tanaxuxiwegipu.pdf
    • http://www.bufolari.com/public/immagini/file/gijimajoparumabaxonitumon.pdf
    • https://hizlipin.com/calisma2/files/uploads/tubedal.pdf
    • http://fitviewer.biz/files/file/4128014925.pdf
    • http://longchimvac.net/app/webroot/uploads/files/90232945596.pdf
    • https://alzubidi.com/userfiles/files/17496018616.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af26bec8b9---zuwatilajarirefufiba.pdf
    • http://werder-ritter.de/UserFiles/File/morafutiguza.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160796aea6fb5d---17361706750.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b763245ac17---32532834096.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=answers+of+class+11+chemistry
    • 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_off0001037a.bin
3a08fe90b4cf595731d7db96529a858ccdfd459187e93558c4e163ccd94c5708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 17344 bytes
font_01_sfnt_off000130a4.bin
66a3520d8e383da6b26485d3248ca4cd47ef75146436acf3be55ccd8ea199e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 10832 bytes
font_02_sfnt_off000149a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149A2 16792 bytes

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