Malicious PDF — malware analysis report

Static analysis result for SHA-256 e760ff4b88b420b7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 19:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdba952293170a6219e8f484e3bc9c24 SHA-1: 5fd615753728d293a7f580eb6814e8bb445086e3 SHA-256: e760ff4b88b420b75b0a0196fcce66afe36d6bd9977adf11eb6f43d34df1e087
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple link farm heuristics and numerous unknown reputation URLs suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sanipro.ma/app/webroot/uploaderfiles/darepemuzuzezubelimu.pdf In PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/mopesow.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/fowuvak.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562ec7e736---14339732976.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/68348038106.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/32386961621.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/96006282851.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/xininivudul.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/41486602591.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/12304479246.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/sewefodikejukerewozaje.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/11116574774.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///76983082627.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/jopupovaradifenatafubobo.pdfIn PDF document text
    • http://tercovci.cz/files/file/zononugaxat.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/16122567690.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/06447bdef4d3a39eee8ab8693ce7e40f/33007276641.pdfIn PDF document text
    • http://thedreams.cz/files/54439485986.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/92461222441.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330e6e74ae2---tujalopezukenopi.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/sekefupejegosewezutoxifug.pdfIn PDF document text
    • https://birotex.rs/images/files/84345630999.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/puxelibapiniresodugogoge.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908105809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=doctor+who+the+arkPDF 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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 18052 bytes
SHA-256: 9aaa77b1d3330eb315a700a3366f64055ba8922d68c8a18985f7ac647f57795b
font_02_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 10096 bytes
SHA-256: b868cfac1077baaedefa78971a4eb41fd2237191153aed62cfc95cf5e38ad72e