Malicious PDF — malware analysis report

Static analysis result for SHA-256 818b5ae3fcfe1499…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 20:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee0ba1e7e1abba1f1e85065a09bc8632 SHA-1: 8c418ae06d8f83e9e6f6c95058012e34352e7eaf SHA-256: 818b5ae3fcfe1499ee2d2824d191b17b631b065beac56db93adb44317637876a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, but the structure suggests it's designed to exploit PDF vulnerabilities or trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=sony+xperia+background PDF link annotation
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/22712255160.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/juvamuk.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/begikizubonevivasix.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/fekegakexepevazezorukum.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/33365918750.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/95968471211.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/66431533785.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/36201153468.pdfIn PDF document text
    • https://akconta.com/uploads/files/83762197861.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/94952832991.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/nawunudabijonigaketivuj.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/25967874682.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/31654658330.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gikogatali.pdfIn PDF document text
    • https://sitarasign.ir/data/file/rotazazigezopev.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/89901260055.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/roverosedavozip.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b844ce03a---kopuxoxetili.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/pirosonegukogalunanem.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/95478236305.pdfIn PDF document text
    • http://esistore.be/userfiles/file/22722137454.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210913161142_u00ihh.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b57d918---62256439313.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/kh3rbb7r3uctag9om8psraqeb1/19404207962.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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 14860 bytes
SHA-256: 1fb01c6a590306b232fb0b52802e9ed53f6f3efa745d998c384ab34d76cdd7c8
font_01_sfnt_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 11000 bytes
SHA-256: 91136762b363fee6702bca2444b79f362f4079fd0a57a4ebb6f7029cf776104e
font_02_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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