Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1b3758031d88d9…

MALICIOUS

PDF

85.6 KB Created: 2021-08-08 07:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d077ebd65986c6b7a4c02a06a2dc8831 SHA-1: 412e516682472b4616c81ed2bf08b6abcf4329b3 SHA-256: fc1b3758031d88d94140d6e301532307f2f8fabe40e992264d98fd56d7cd2d94
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, acting as a link farm. The primary purpose appears to be directing users to external malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=gamo+air+rifle+repair+manual PDF link annotation
    • http://kuzfarm.ru/images/file/78956223064.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/xodom.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f56b76d0a---zojuwabixokogubezabixili.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eef764ced---68418290521.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/s07ac0tp04r5ceqcfaupi6m0ne/64766695156.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jabujowixefenof.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6d642ebc856219bb17110b39de4d267c/zuzuwegegizomez.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/nenowesodigo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/761bbd78f4ec64a965e4ab689f71962b/72661638526.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160773b5e697a5---tinakutibo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/3780029729.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/xajajikujewiner.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cb47f79a---nebomuzijonepomalamowal.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a3eccd14724637bacca162d2b0e28f1a/lewowikuwududir.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/merofajix.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/aa1mvh8lv0med8lpnpcr9kn6u6/juxolonibavesemekuxiduwu.pdfIn PDF document text
    • http://gugugroup.com/userfiles/wabezubureburoxusimi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f9d45273f6aa0870271ffe152ce4b25c/gajixijolitise.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1o5jn4sm4it6gdo9gl6tdidq70/92611013359.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c347e0e2431---89903066750.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/49165304412.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6246e10317465baec79a909f8f3b52db/solusolo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/295214946bd436597e135ee4e611e03e/babewi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 1968 bytes
SHA-256: a6f56672542cfcf8a8ee4edf0c8c6d3fcc99e9f68d5f847f6c7eac341af0623b
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 17312 bytes
SHA-256: 7d307def1d0de4cc99163632eb48c7b3673d38d85866ec417df3b40118f3b6d4
font_02_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 10392 bytes
SHA-256: add46b221db769921cb248d34ee2b873333566cb19bff43ab43dba0bacecacd7
font_03_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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