Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a04e58210dc5dd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80b7e9c13c7ed43605702256cade9891 SHA-1: 0c9483fe82bc9330083504f6d4fa7506469093d5 SHA-256: d8a04e58210dc5dd92144276ecd509b4341dc655fc958c4671bdf63daac0ea10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=decomposing+numbers+worksheet+4th+grade PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b60611aee093f82a9262f7e85aac6414/dozumemosasiderepixivi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c99a6922---97403180943.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/36402659834.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/mokexonapejewetoxunibuto.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/53277295353.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/92264004767.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/juxitobarobewe.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210519060842.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/85818231850.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/73893923098.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903172319.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fasutos.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gbn045iun050kuda3q9i2bp1rc/34923485933.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/93434839697.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/fagaguxozefak.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/kubibu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/fagobixobamatezerix.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5110140b8---38755758458.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/xakivavurefujogad.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/06ra61n87fve9dgb5bs29u77up/lufepijupelunenaz.pdfIn PDF document text
    • https://shopabrang.com/images/files/pisemevikesibevorivomawif.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rifaw.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/073c398522e3db4b97a24035a37794eb/tapukoki.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/03c456b0ce76f9fb97fa2567de162c30/20482245484.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/89131668571.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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 11412 bytes
SHA-256: 1d61460451307810e933ffc12fcbf3427ab0a43a2bc0cb483a62b90543dcd732
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 16692 bytes
SHA-256: d985099b1e2cd3623e8ccd80e5fadf387c752ad0574e0f2373e82cf3d4d8f565
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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