Malicious PDF — malware analysis report

Static analysis result for SHA-256 765f8b90f8090dd0…

MALICIOUS

PDF

88.3 KB Created: 2021-07-30 04:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fa327ce1594e42588101f0d15dac503 SHA-1: 09119a200d41f33cd35f0337ba4e63a29d4cdc5b SHA-256: 765f8b90f8090dd05de86bd0307a4f5effcf7bc028b6c0f59cf3f5d279986d4f
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to engage with remote support tools, a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://infrive.ru/uplcv?utm_term=honeywell+home+rth221b1039+rth221b+programmable+thermostat+manual PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/197aaef46439b02de0fc64382ccc717d/45142571382.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/judenoweliwulepu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30953b8661---xorifurebad.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/wirigar.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5ae8986c---rekewujaxataxubaguxin.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/dimetiguwogusezuwa.pdfIn PDF document text
    • https://menu2uplus.com/images/file/5224728502.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074362ec66c5---zonekevofojozotugaxala.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/segagipadabom.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b794f1f250d---limafazelisodemijowutivi.pdfIn PDF document text
    • https://kimcert.org/E/file/xotolarute.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fabfa977a0b---witijovevunuboxi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097671d3f5cd---24702782253.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210721_151721.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/344rg6i3844rsef56dd92hfkc1/narusituvaw.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/27658403907.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/7563277899.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fa67e227---wizadepodadonikorerazere.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6cb3d2c2a7509c4d929888cf448fe30c/7825760464.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/jenoga.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a87a080e28bf0f76d079c159d02c273f/xasinotesidanor.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xozenaxigedet.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0df6598c---39435551404.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16916 bytes
SHA-256: 2b4926b95ce28ae6680fd83add86a4cad3b7ebe7e576d82ac690c4a72950d65d
font_01_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 11672 bytes
SHA-256: 5384dda63858895aef5853ac378d40d50157b70fedd2098933f6fa95846c2357
font_02_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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