Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec26a863569959cd…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 17:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c79eb51053ca9315486b46b3b8910ce4 SHA-1: 48582b5030ad01f643cdc8d7301fcf2ef062ee45 SHA-256: ec26a863569959cd8c3b043669e21bf18ae87a0b930c7a9718575d52ce727fd9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and the nature of the URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://veewood.com/file_media/file_image/file/75014484594.pdf In PDF document text
    • http://gyliver.ru/files/files/vekonilalepovijasaliziwod.pdfIn PDF document text
    • https://superchills.com/userfiles/file/tujodod.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/50521582607.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/delobawav.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/wizolokevikeniki.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137209c95b21---tanolijadetosezixo.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/gilimiriwelelaxo.pdfIn PDF document text
    • http://gyliver.ru/files/files/gavivib.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/furipefakijewidugeju.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210904_C539E770A75A41FE.pdfIn PDF document text
    • http://geasit.it/userfiles/files/50686577178.pdfIn PDF document text
    • https://designclarf.it/file/luxagimaxijafokub.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/furejevenewowe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/81aa334da86fd53b39720e249612a472/jegolopiduwugidiwenawi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/tetemalamekosogug.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6bbfedcaac5cf012a65639bbfff48772/zijamedoxen.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/83680489013.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/11972860097.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/tafugulugufubu.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/zikofiragafava.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/jiwovulitogitoruguju.pdfIn PDF document text
    • http://malifer.hu/upload/file/digiloposa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=present+simple+and+present+progressive+worksheets+pdfPDF 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_off0000c48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48B 11188 bytes
SHA-256: 10e4c571ca48bfe43a6eb06fd784f9320348f59af7adf8d18eeaa5ff85befc4a
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 18032 bytes
SHA-256: b91bfbb46d9d33f750ab005d71519d109408d8fb0080fc8f43e011f3d3869e06
font_02_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1