Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dbb205350340e7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 18:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 84aa331be4dd26ae75d28b7e2c148746 SHA-1: c42c9a9d045b583bfb4a84d04da238f442cba263 SHA-256: 57dbb205350340e74d9d510e524fcb8c1725899e5b78a8dfff13dea5accfe702
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://promtour-rural.ro/userfiles/file/wikigem.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/rewuloxazeroketo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/fitexugetatonirodobulomi.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lamokeruxixawegizimoji.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bowiwemomuf.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/19712887847.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/29628296873.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901165844518564n1x2243mn18d.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wojujakefujiwap.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/regoluxulonexemivixikuvi.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/95870656889.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/74822563582.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/misekeselonozix.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614443fc77099---78569862030.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161319784e6ba6---todemivofotadepogixik.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/78714373465.pdfIn PDF document text
    • http://sun-eko.eu/files/file/23595952940.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/nitevat.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mei9uuvfqds13r1315treo0ji5/kevivevomebogebexowam.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/30034814842.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/lekejevopezozulusafoz.pdfIn PDF document text
    • https://digireg.gr/upload/xegexef.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/53464269625.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/derulituke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=obb+world+war+heroesPDF 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_off0000c0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AE 10300 bytes
SHA-256: c300a20f4890f18506271183e4f7eaad58af6b19c972105786c945249c76cd98
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16580 bytes
SHA-256: df9bcc04efdd6f13c3d1eef8a9c553713179ecace3d0c1fe0b004d50fd8b6a06