Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf0216ea515588c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 05:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d5376a49e7c105f73ef9276f11e1eee SHA-1: 6587ccd37a8bcca44ecc59942a6a8da1907aee50 SHA-256: 3cf0216ea515588c80dc3a64caddf55b806a3214324ae8856cde35adb5a04c42
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chetanaus.org/bheru/uploadfiles/file/83591399791.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e64f8809542ce12bcec87dc11b5431ed/56786215372.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5e40fa892278712c670bc8e6dbc701d4/bosexolijididelob.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cc415513---22961885335.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/jamafular.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29343559710.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/bovazeseser.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/527cd6cfd0817034115536a35b698848/kiwuwumetazuwiveduma.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/18560897770.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/97993013814.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/bimasagaselepazaf.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nulusaniji.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/kelesa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/48361989700.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/297dc22cb69e93a8bc8c11e4f2744684/sedekebovomojuxojuwu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0d41f151---62382326356.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/tunutumilidapejaxajuj.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/43170283837.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/23282729878.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/g9li3uq929ufac1rlodo11fvvu/56666185540.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/28385671352.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/vozototaketubofajutoz.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/jiradonijutinanebafam.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/turomegat.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/70269270064.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/gasunuwutexalazuvivami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adjectives+used+to+describe+places+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_off0000c336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 10924 bytes
SHA-256: 673dca86e8c0b89e84cf1384dc7b8ad85544cd3f75a3fc1c08004f05acf6ed92
font_01_sfnt_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 17096 bytes
SHA-256: f07b1ddce2277c68b6c4c21b07190ad090b21787f3b4853c09de46e86e9a7554