Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b61c6b9da94b412…

MALICIOUS

PDF

92.9 KB Created: 2021-07-17 17:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea94b5a49cd332833eb5742afc7d4f3f SHA-1: e001636ce04d1ef6a6bb5791fd2340f6ec37eaaa SHA-256: 6b61c6b9da94b412f2984ba27aca3e3c2b3a74bc968d34ac3b9db003671da276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into clicking through to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/bfb58807a42fcef89e748e93cd1453f0/zokexixupiregasasituni.pdf In PDF document text
    • http://biirbeh.mn/images/content/file/dobez.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703eb838788---37441404582.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/rapalusatarugorezax.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6adf604c56---28579533357.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e335469773c100055d6b3245a6a00a80/gekabafabogiwi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/792f4970cc901a478d9a3493d1950f05/53844630992.pdfIn PDF document text
    • http://abc-tel.ru/data/File/30367119111.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ab8ae263---lepomajafekivuvagagu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tawaminejewipigifalizur.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82b334222---waserabebifokotad.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8c08cc12---letemop.pdfIn PDF document text
    • http://siembra.me/uploads/files/23610411594.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b449349e03f---3462294541.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8ee5124c---13089744906.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210615230017.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/gemebelizi.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/88643931904.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/46jpq83ncmk3238slt9kdl3hf6/vovazexumim.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/mezidifidavogirekeporezo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/piwifesajufazixizorerese.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609646cb82e4b---24248456180.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6e209295---kabujowosebipu.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/88240540292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+cite+the+declaration+of+independencePDF link annotation
    • 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_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10624 bytes
SHA-256: 71a81edcf2875389c8241a0267a9c49fd5bcea378b3827dedb79c86e1436ec3c
font_02_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 17500 bytes
SHA-256: 36f17643d0196abd1680729ec0dcd8dd47da1fa079625077948f92f0e975337a

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