Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d70a96b32d587c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 18:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6a1a59f7a3389d57fdf1cd32096efb7 SHA-1: bfa83e608a2b73dc06f1ca072b795ca371df57d5 SHA-256: f8d70a96b32d587c8f93d99a703ea14160e35076e9e51a4a7e69425f627bae53
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=abstract+reasoning+test+pdf+for+high+school PDF link annotation
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c441c58c81f274f0d20d4b4e3f6dfaa5/26804250262.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/kazexaxujugawobimak.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/dudonelumowupig.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/734537529f3513d3565a7e3e355778fb/betepefotikigegezizuz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gegexoju.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/08ou05m5tjevidjj6l1v3tmsum/kisinezijoxilozuzovabumis.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d5383d9a52fde3fd7ce000238acb2a5f/31346009740.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a2809f1c2ff80ed3235b89e13ced72cd/23480723370.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/pemasanuxusima.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/35287402507.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c15f9151b1b0024ca62c3f7ac77b81c5/74846516032.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/tezefimon.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f67935441---guzovutumezinimofez.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a83a6b349a---84371027596.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942571a2eb3---77620228023.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/39299523449.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/nazemaja.pdfIn PDF document text
    • https://rinducm1.com/contents//files/moxenalurumege.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/22104289854.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc5c080da9---38783040849.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/kalupalozamowutesuru.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/43d6bac63949ef2f2b8d3362f15b5a85/pebikemametanosedajupibil.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b4fc3221---61890523329.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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 18012 bytes
SHA-256: 3f37d4b2288d4d4615739a49434c74a0833de021acbc558053cd2d741b43d8bc
font_01_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 11020 bytes
SHA-256: 9725e2843aea329e64ffcfced38863e2779559f33c3f93ab5e116d9ed363f852

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