Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92f2bbcf44be0c0…

MALICIOUS

PDF

87.2 KB Created: 2021-08-07 15:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 071b4e2351d816cddf5031773d359a66 SHA-1: e6d329f5253983ad0fbada512a1cd189aa5a3439 SHA-256: b92f2bbcf44be0c049dadb0381593e4ccbaa5c6b43d77839f5713f9ed0c70ac2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=fluke+voltalert+1ac+e+battery+replacement PDF link annotation
    • http://oprfhs70.com/clients/879438/File/vixobodefusodalixusadem.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a052ab56657---ludisawatitisojelufujube.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/17b96e0d6432f4cedcaf914f8fbf1876/22600603788.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9f72b6040906be32aed0709c064c39a7/xisanozogosaxodaj.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/31845154782.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/42284614711.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/831400d2fdc9b2ef55a5418d9ba46a4f/furifezuw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c01156620---6125856986.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/taran.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/lixubixaruxozuxa.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/527c7ffd5c3823413cbcc955d4fdc269/tazujozugerepuvixodijefuf.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928da5da5d3---26460193221.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/vipomitezidizeripamuxe.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xosigurijikel.pdfIn PDF document text
    • http://candientushinko.com/images/file/66354580634.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ivcapc9ightigvsf0jug43avm9/vewikeni.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/69618335600.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/wibitexagogogus.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/73d83qtcgdtqfpm9htf7j4gc8g/98981977116.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78098ce5f---481135247.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qo5djr4acfpchbuqr7tv4nhim0/58722671480.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d0f660e67ac48f08b222aeaf94ff9cc/25677510735.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/40487615010.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/24336363274.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfa8886a9---52956786198.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/12a15b0886eac6e67b528210269fbaab/18376423605.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_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 10816 bytes
SHA-256: 3b2d7f5034466638884bfaac90ad4841f477559be12f4371cae355315e3abef0
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 16032 bytes
SHA-256: f25c97ab671252046e76b8144ae15eb2e0763635d009a98f4e74ca0c5c6bfed0

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