Malicious PDF — malware analysis report

Static analysis result for SHA-256 87664b653b46ce09…

MALICIOUS

PDF

93.2 KB Created: 2021-06-27 09:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87bf49638c2c421805ab0e3d74a6ace7 SHA-1: 63b19d712838f526ffd62014934312eb2f13d03c SHA-256: 87664b653b46ce090df62395625352c97b474e67112d3cdc46f17e1fbc100644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a81dd35c---nobagato.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3de7b051---jatiloginomek.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a24b788---33797198628.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/s75e5f43i6c34q0i8vgjgeetbh/67449588239.pdf
    • http://elementsgogreen.com/userfiles/file/nizubadavirivugumimir.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/jibalolubumubev.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/13fba8e65e275a97a448f4c803e22402/98695983397.pdf
    • https://unserbiokorb.ch/userfiles/file/nezokedepasutimedojig.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073edfe73a22---28479342245.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e059569f2e---15141926508.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab9fbe1f0---munevadejunuba.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a8568a2d---jasapoxudu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609096564b4c2---44541248800.pdf
    • http://mikomisushiwc.com/uploads/files/wisazu.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77945a10b4---venorowo.pdf
    • https://acryl-bg.com/userfiles/file/36852376681.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6368fcd413ea253f44f2f8b259cb5862/pomenilegas.pdf
    • http://aircond.md/upload_fck/file/pixetolijuwizivuwowi.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c910991a---85876311548.pdf
    • http://xlsferrosilicon.com/d/files/marelijaratebufudumexe.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29363608b9---80067684127.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ef0bc4ac79f7d6699c57339ebfe3f487/gezojesuwufemasama.pdf
    • http://abovomedia.hu/_user/file/boxipobezotu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608699a8863df---serosetu.pdf
    • https://lukili.ch/UserFiles/files/xuvadodugutolovafu.pdf
    • http://www.annaleehuber.com/content_files/file/11875886805.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/356e6a7df6f1f938733e78fb8adaf082/xolubejef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=solid+edge+2d+drafting+2021
    • 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_off0000f7e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
font_01_sfnt_off00010ffa.bin
e307ed51b03e3a4bbe8011c4da66143752f9532076b0ea764460cbf12448a8ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 10728 bytes
font_02_sfnt_off0001289c.bin
3cb109276075eaa05e5bf260af900c061620060481d7c29efdb286e12bd87e87
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 30496 bytes