Malicious PDF — malware analysis report

Static analysis result for SHA-256 725db7bd5df39783…

MALICIOUS

PDF

124.2 KB Created: 2021-09-02 19:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7a1f1faa59a3050479da41259a5036b SHA-1: 9b5354eb93655e32c0834af616db3340e13bfb51 SHA-256: 725db7bd5df397838667e6645680f58877db044a871934f3e3774168ef31c59e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit vulnerabilities or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=historia+ikea+ingvar+kamprad+pdf PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e201193e7e---xiwewujate.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/lijipodupalonodiwetobil.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea9cd6976---58014023644.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/pogavubupodatugu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/522b01f3803672b18a61c232a6c69305/noragegixuvi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/52jqnmk0i264d4b6iqendn4899/31452370016.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/99329468847.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/numubopukijojunotiba.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/lukideb.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/51bf17fee687675f9e2eafa32430d675/wosojofozuvaj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b050a614c3a---betikeg.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jadawifibo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085768c1db4e---2832387491.pdfIn PDF document text
    • https://businesslife.com/content/file/subajezidopedanefozura.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/q3cbqo2o0o7srlrd5dbmq271r5/43760696333.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dbe7b13c0e3612bd8bc5500732a65489/45574252419.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/viwugexomefevesu.pdfIn PDF document text
    • http://dc-dcc6a74f5368.loveparty.ch/ckfinder/userfiles/files/67995135380.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f4776567374---davegotos.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/genivovubug.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/magodolezibatexugo.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/95035078250.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_off00017a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001921d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1921D 20748 bytes
SHA-256: 21a59f76beb98efa1ca54a10beeae3f63607fc14d0a285a7ee68a87599819d0a
font_02_sfnt_off0001c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C857 10944 bytes
SHA-256: a916bfd51240a5f23e6fa163d9a560392b91c79765836ca786c81fa4f7bcbe68

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