Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bbd267d0cea9e0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 14:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2335f3011e96a662efd82868c43c7129 SHA-1: 849000b039237a262885018d70a8df78c3ba361d SHA-256: d8bbd267d0cea9e0bce191c1e057dbf31efbad83409d4e7d260983f8e3edc520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yucehukuk.com/resimler/files/bafezi.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pilisas.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/70835365323.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jubukolotaxalijoruweguji.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/kovupoj.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/30379805311.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/samoxesulofoxoka.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/64467325837.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/bujuvolewiborunitisepow.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/xinusamabaj.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/1299769439.pdfIn PDF document text
    • http://test-immo.com/file/zurejapebifovukuwozuris.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210901063142.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/nefofiniminagofage.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nakepesutud.pdfIn PDF document text
    • https://ntc-container.com/upload/files/tebimimesejigen.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/bidenisorunavuwa.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/8795331764.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/17139090110.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be900f6aa---75752478395.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf39a2afe---porinoxu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9i4d72bcsek0olp9cms96r6p0v/98484204757.pdfIn PDF document text
    • https://clickbox.ro/images/file/66349779522.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/rukubojidalimonafilebege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+ultimate+ninja+heroes+impactPDF 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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 19692 bytes
SHA-256: 8db1933b7fffaf9fa35c679204cc605647064b362bc186d9a26244adfd5323aa
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10848 bytes
SHA-256: e8481414c838b4dfaf8b709bc87acf40c4a6fb604c214c5ac5b38c91e0c9d386
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1