Malicious PDF — malware analysis report

Static analysis result for SHA-256 9554d7e4af9f7668…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 09:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 533c0c44f08640be18829f75617ca49c SHA-1: b7e478cc65732474fd020422c387eb50835d9761 SHA-256: 9554d7e4af9f766880957c99a43adaec982de259b53405d832fec39827199b17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links on potentially disposable hosting suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pi-consulting.ch/download/59876419294.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/r48b00igojjf34ln9nk39fnshk/23141577035.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/vutamolij.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210910231246-topeluparokoni.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/71802435996.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/45420883008.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/vifukofokobiralojive.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11c8f7ab53b74394bb6efcd843c21ce8/vuxinelenukelubiluz.pdfIn PDF document text
    • http://potlista.com/file/files/libopirumubef.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/60361492909.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161312fd83c21e---ranewopemewawaka.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908013440758286.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91933321945.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/woverozavurudig.pdfIn PDF document text
    • https://sainaudit.mn/File/zezadoboxojabalobidab.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910045525.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/15717598359.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/84619618667.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35dde6f9f---bulepewixozexof.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5edc0851f4775a18e9ec2aafefea8676/jowaseranevofok.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/wupefi.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/kadoguforuguduwakelede.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wefopoz.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/22657258533.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/16208025445.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f6c8dc9850ca4f81a61f1aac0538be45/mevekorubinebevaxumif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fear+the+walking+dead+s06e16PDF 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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10904 bytes
SHA-256: cd4975acc92503109a233b32217cf02319d1d1447d0ced084a3dcf98eb9c0727
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 17292 bytes
SHA-256: 8209b9bfeb4a6cb393d2a3d263e4a5a7307f926a7986f42ef04fb89c01e95696