Malicious PDF — malware analysis report

Static analysis result for SHA-256 8910acb6ecb52ce8…

MALICIOUS

PDF

93.5 KB Created: 2021-07-06 12:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122c2223fdb660eb6e33345d1cdcea80 SHA-1: 82b222b6ce7d66dbb54f3689f8d837d2fd7cdb8a SHA-256: 8910acb6ecb52ce8814b523a8e25bb1cff081ff2213b25d990ea00e512460d04
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/na9gdfpgunjcqekq437rvfemd2/78553121969.pdf
    • http://amuseonline.com/absite/userfiles/file/84229022661.pdf
    • http://flatadministration.com/uploades/fckeditorfile/mamenufake.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607deca5a658b---lisovuvajuxaw.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd66e9eff---14803235108.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787256af8d2---40080675920.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2092c0d386a9e2948bbce481f314a9d4/vevofotu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d198f889d7e---xusukakalefegizo.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e50feacfd25299ece46bdbb8be132cfb/gowuxefaxulevasu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb6c0b388---xotesode.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/bijawebatikezimabolufi.pdf
    • http://alexlunacoach.com/img/editor/file/xosikulixopemifap.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/66a7feb6d3d0a53be27e85205b06b44c/91365858457.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862512ea5ff---lubevejijilozifixetoga.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-21/20210621033630490131.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ba5d78916cb3ed2c1b2155fc33d628ec/pajapivomuniripef.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b93d4039---48451356272.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e508ad8a8---miguradutukopixipab.pdf
    • http://espacioschillout.es/images/admin/file/lebikak.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de12bdd1---busemevutufarixowig.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd717f096c---kedotogare.pdf
    • http://jubileejec.com/userfiles/files/7936302651.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/95b16970e1d71714b02c601f1a153951/84189943901.pdf
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/70286337887.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a0d2360b---doregabigajojoniwipuxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=2019+ap+calculus+ab+free+response+questions+answers
    • 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_off000109e0.bin
0284ede4577420b98eaaf877df6e61f6b85623988ce89b667ba92ebe582f1e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 11312 bytes
font_01_sfnt_off00012488.bin
da6b784714180c913d11dcb6f0455ef3f830cf0d3f69a6d1eeaf4e442df05285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16760 bytes
font_02_sfnt_off00015016.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15016 16792 bytes

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