Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b85461c14e60632…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 14:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f7c5ff6c732558ce796af37592260af SHA-1: 1c2abfa17ed85267a29140fcefa0e4e9a2831c51 SHA-256: 8b85461c14e6063229d29dd894fff128bb0696f42ed08a7f15f80a7e5957878c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://laborke.ru/uplcv?utm_term=maquiladoras+ap+human+geography PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8vtklo8qakcvjeebe6296ie9ne/47967165207.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/39762847824.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/30561347183.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/gipubo.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/18071771988.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/258899107.pdfIn PDF document text
    • http://airmon.hu/images/files/vutizim.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9163b1bd---rizosizagujofawajozef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a840411bb---3159196325.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xidakinu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b0101855b---40926188952.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/527b72803adb5f1a7e4f6cce3711ca10/61572943907.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aaa68c06dad2e4bcd7c766bd30033238/wezigunipamuzubuxam.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/35678083427.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611938403222c---zibevatowa.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/4362928527.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/15176110323.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/18359282789.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/pamokimelavomojesunix.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6927f92b1cbb0f85048bdbb0b84a81c4/81045020180.pdfIn PDF document text
    • https://svltv.in/userfiles/files/xerarefutofipab.pdfIn PDF document text
    • https://jagominum.com/contents//files/87040878181.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/51334987310.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/82279459550.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/97942900497.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4074d94004---47534958451.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/gapomafufazurujub.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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 17820 bytes
SHA-256: 5e82be9a7d9ed40b8f324b7a6cac433b826e359f790ca48f6a6d0ab74fc79278
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 11092 bytes
SHA-256: 714ec7b715f8f0cf78bdbce69325853b75518c864910d99a5aa0dc8aa1ff3bee

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