Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf2d3609fecf5a9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 16:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 001c2d68557a5827f6a6a29e3884c1b2 SHA-1: 6ebae4e18400ddb50ef85826ac6c075cbe0c9e46 SHA-256: bcf2d3609fecf5a9efd5344b8b6810c0a33d0f275830abe01645d2e45d413c9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=suicide+squad+hell+to+pay+streaming+vf
    • http://tiszaikaland.hu/upload/file/75116305961.pdf
    • http://btfa.tw/upload/files/25494895263.pdf
    • http://okmarin.ru/userfiles/file/4909353419.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135070f241fe---lekamogudasapakafobeva.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/82722681356.pdf
    • http://siciny.pl/userfiles/file/92459582677.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909150022.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2b1af6a4df0095484009779f5d2eff86/mazamupirurizolideripus.pdf
    • http://chalappuram.com/userfiles/file/54644352081.pdf
    • https://machnik.net/ckfinder/userfiles/files/4399500483.pdf
    • http://shinies.ru/img/lib/file/sitinoxetadabem.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/xavivolomikolaxipudiwoz.pdf
    • http://gysanya.com/upload/file/210909173758633722oscv25ozmrdb.pdf
    • http://dorrstrechy.cz/UserFiles/File/kopajutagejuwi.pdf
    • https://serka.com/serka/upload/files/63295464385.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390081979d3---jisifodene.pdf
    • https://sanagustin.cl/files/xiligokiburep.pdf
    • http://sushiyaslo.com/uploads/files/60502824528.pdf
    • https://bwawarszawa.pl/upload/file/tefizi.pdf
    • http://arcenevents.nl/site/upload/files/kakiwibapekebazirevojegub.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cfea154d8a180390871855773423546f/juxudabunuvawonujenu.pdf
    • https://vyrukrc.lt/userfiles/file/luvuwuvimetiwogurupinir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bea8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA8 16792 bytes
font_01_sfnt_off0000d6ba.bin
3bb4ce431b367eb91f7c8894f0f5e54da154b23549358740ac707d23f3394ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 18780 bytes
font_02_sfnt_off00010625.bin
e8a6aa4da87ea26e5e3fbb36a991b8ee88a0d4ed5d2d85fec9199aa39325e15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 11568 bytes

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