Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc9314ea06ea330…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 12:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dedbac5f369bf4c39011e9069520ee8e SHA-1: 9fc3a6cbc7ce81e8aca3c82589af4293f616c38e SHA-256: dbc9314ea06ea330b30595f44d7b95b45e3f74375e66a03c11945e4f149a52cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several of these URLs point to compromised CMS upload directories, indicating a tactic to host or distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=css+texture+pack+gmod PDF link annotation
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/923490751.pdfIn PDF document text
    • http://beijingteye.com/upload/files/segomasa.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///7609927659.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/dafudununatiroxom.pdfIn PDF document text
    • https://online-wums.com/files/files/reronojugoxeguna.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141b45d8f79c---xeziwovavufenigekuvaj.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/ruxuguwubogolupiwulorewag.pdfIn PDF document text
    • http://teresachild.com/upload/files/motobogozuxitodenulu.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/sekigijoxibizotunilalal.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/jifuvatos.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7e975492---64295800320.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d6fa3db48e858688882bd96650ed727/lewokakabikejesazoka.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf16e64db2---gilogazodeb.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/gojafimuvulonofe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd498435f---72281054657.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/59584942331.pdfIn PDF document text
    • http://full814.com/upload/files/nonugetil.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/48324127848.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gazuralaben.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/72716409841.pdfIn PDF document text
    • http://offerparts.com/upload/files/40762282764.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/57682821797.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/40142724644.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_off0000ad75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD75 15168 bytes
SHA-256: 0d449b51a4f70df291ad99970fc52b64c368526b833bd7921f5d8223eb1a40ee
font_01_sfnt_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 10940 bytes
SHA-256: 20764e2165b0f707e740910fe7ad2712909d7d2155279d0827b02684a2a9e56b