Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e356595dacb24e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 03:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e3f30afca36241bd950e6309c7b7c7b8 SHA-1: 0dbee534b26964d120afeba07b50e0e59961b473 SHA-256: 13e356595dacb24e1ecb890a2237d7411c7ba92a05d04a789e969412f071523b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable domains, such as 'cbelmira.com' and 'tutorlookup.com'. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chcial.ru/uplcv?utm_term=android+camera+as+web+camera PDF link annotation
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/dirosoxosak.pdfIn PDF document text
    • http://cocoal.com/uploads/file/besatejigadugenu.pdfIn PDF document text
    • http://sissonne.hu/editor_up/dunaposerasomakilujajexos.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd3da8120---33965918182.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e6127b54b017e211d26827d2ab3aec97/mafek.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/rulikax.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/bujabujubixerat.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202196131532210.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/risazub.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/98756714715.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/bemaxabexad.pdfIn PDF document text
    • https://primer-spb.ru/files/files/wakirotefaseso.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/bibimilejosu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/3030010164.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea510acec---goloxuzesafi.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/40205176380.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b515380529878fca4a48891930a58bfa/zegiwevaxe.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/27840466284.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/77129c5d891ea334ecb8a8d35e626fac/melajalanetaboromaguwi.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/tujoboserebuvonid.pdfIn PDF document text
    • https://shibbirs.com/media/files/53071132632.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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 17296 bytes
SHA-256: 9cb07fb545b476132740fffad1ec530b2e4d952d788b8512811f55ed4c1c8326
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10592 bytes
SHA-256: 7ea760fc32da0ae22140b4ecb95b26608231bcfe77d288a5d530ecd148c54c61