Malicious PDF — malware analysis report

Static analysis result for SHA-256 b024066d86ec5d6a…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 23:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 412e24aa534dc6a7d1c0b39c3abcade6 SHA-1: aa54a890aa599e942b6d909024f00e7b6ad1a3c2 SHA-256: b024066d86ec5d6a71a4aa3a26280bbca611eaadf815c1007d113eaa05404c54
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.profiemg.cz/upload/ck/files/kawopezimi.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/10ucnimvu38v9frboiilb3ij0e/26940303736.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nafafasexovegarizit.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/nujibapudutezaja.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059e018f62---85708677081.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/25183386768.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/32631892309.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/n5l59jm93tjagea7dtctc59c4g/34606118778.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb67bc6e1b---visetaxadefapefivikagi.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/vobixireledimawalorogid.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/63823506806.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b613efe7293---xitididuvajoto.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/40060121944.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b43565ed---25166703986.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076772399fe0---foxawosozukuzitakuzop.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795a0d1ccca---riwozizinivubajevem.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/92130059965.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/06c52d34c5b9901fd8dea3b70c3b1ba8/2066131945.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/duretapif.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/82399264649.pdfIn PDF document text
    • https://saam.vn/images/content/file/tasitenelodenop.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc2d87aaf---7419738359.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/dd94f9196b372bf25241a78b8125f6fe/41829779384.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/69436371983.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d062f13e451---41515283931.pdfIn PDF document text
    • http://ubest.ru/images/file/xutiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=good+sketches+to+draw+for+beginnersPDF 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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 17572 bytes
SHA-256: 8e5fb135f9b6b47abe150153af24257337fe7b5c47cf17d36e6b2035c811ad50
font_01_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 11064 bytes
SHA-256: eb81472c8553d6b8672800381baea67b32317dc7d74ea43b854c685a37b19e2b

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