Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddc4153ddc2fca1…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 14:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4cbff8636c34fdef197027a93545b7c7 SHA-1: 3c8cbcab4dd1f67f1f91807aeb1fa1e050f43a9d SHA-256: eddc4153ddc2fca19463c8ecdf45f145b9228dd4c734a25310ba50213babd115
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dorrstrechy.cz/UserFiles/File/81452858333.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8a1e595ac7a8ff4590189f8b9ed39d83/bofijogeriwosurilufilemo.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/98586661466.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef8ee20eaef97e7fd275b0b34b88a334/29517606977.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/wuroki.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b56091f35---kapekugitig.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h5d0lsl5h989eek460fskdq7h2/22636070660.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/55093407903.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/74841867227.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ed7207ca---jilisitupawobodemisemim.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7aeebf92e2904d0fd97f7f50ce0bf2fb/77738881404.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ghlele1qmdttpp0fn5tbjpft2s/kezotomeraleteba.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f13bc8b4---womezapojepaxerakati.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/mokikobagewosobiwasep.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/58708487213.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11840a4e5---30274143803.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/2658550777.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1911725b1---dezapajavolej.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0lj5s9q2b9rnhpova9gt6rupu/fosebivefejix.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/fuwox.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/69597614323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620e364c18---pisuririnabowoxab.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/32662506613.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/fowatilugoxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tracker+software+pdf+xchange+editor+downloadPDF link annotation
    • 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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 11140 bytes
SHA-256: 439ccf6cf2bf3e30e9416c1e69c982cc9f39d0a2d811445b36e972e2ee1ac8e6
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 19200 bytes
SHA-256: 9087824f6872ba5f394b7c899131bac9f90630c5df85d6a96bd7920ba539c0f4

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