Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1646b89fd03c84…

MALICIOUS

PDF

70.7 KB Created: 2021-09-07 21:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11e6a836a4bdec8f1f9578d1bbc97e47 SHA-1: f6acb9ec024f1cd9bb2d58b681b2f2670755e353 SHA-256: 2c1646b89fd03c848976f2d5631a5aaa9974b04273ad784baca6f3c012f27ea0
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as redirects to malicious sites or directly host further malicious content.

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://crewmak.ru/uplcv?utm_term=chicago+manual+of+style+research+paper+template PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pa3pplc2i9ujm656e8li6csf98/zojog.pdfIn PDF document text
    • https://wangwangcamp.com/uploads//files/202108071557225296.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/fabate.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/43793288671.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e75e257ca47---burubug.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/67050159770.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/dopunagok.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a57321e36ab2ea2c857c360644f9b9d6/35413572781.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb07b1e3---37494248803.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9e0f0bf---30570129674.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b99dba86d6---78963497856.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jugusiresawivagunosa.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/33076485017.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xonusenuzoditag.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/2725183170.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/15856746511.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1e148047b0c82a2ef97fe34ae022e093/nepaf.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tigeraduwaronolakilanewaz.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/dagorumolido.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/piler.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/agfc748ueta6qj3imqdr15u9jm/zepigemoxe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee715060c75---96073861649.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/zelovudative.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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 14916 bytes
SHA-256: 2e5a3de9396316887e48650d76b33c221254b6802ab33bdd9e8e315d4b2afd1c
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 11172 bytes
SHA-256: 9eeec8cefd3b98bc0bb06044a237eff35f053687c7be5759ba836cb1be0e06d6
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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