Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1e2c7632c673c6…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 04:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad79aa09ac8213b7fbf332130ea5bb9c SHA-1: 179b8dbd79597d0c8bb5a4e82b9703c28579363d SHA-256: fb1e2c7632c673c69d18d418b3d0318d0154d084a6fbbc6d31c850838452b879
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is structured as a link farm, with many distinct hosts and links pointing to PDF files. Several heuristics indicate that these links are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59957500762.pdf
    • http://meadescafe.com/userfiles/file/vozadun.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb9e452a---40407368397.pdf
    • https://jamuiboe.com/webroot/upload_media/56079043678.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vusabogutidijerepejit.pdf
    • http://www.armstrongre.com/files/files/xojaxojiguses.pdf
    • http://archetipoingegneria.it/userfiles/files/nijuwi.pdf
    • http://yangpupark.com/uploadfile/files/wokadepenunolabisazujo.pdf
    • https://tuyendung.vinaonegroup.net/upload/files/53088683527.pdf
    • http://shiinamotors.com/js/upload/files/popumesadijukoxesogoto.pdf
    • http://mylodge-naoshima.com/33669846686.pdf
    • http://rapabzenec.cz/obrazky/files/tepiradakisavavutone.pdf
    • https://tedvandergulik.nl/userimages/file/75313587575.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f318a535e920ea42db2872b5491bcef4/21178614883.pdf
    • https://pt2-turbo-j3t.com/contents/files/dezusawunapulixixapugufe.pdf
    • http://slsnn.ru/content/file/zomemake.pdf
    • https://hahapediatric.com/uploads/files/202109130546528191.pdf
    • http://bebelino.ru/userfiles/file/39257815745.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/xamipoziroso.pdf
    • http://agataklimowska.pl/userfiles/file/95960528260.pdf
    • http://planet-for-events.de/userfiles/file/29963719836.pdf
    • https://kisikana.hr/UserFiles/files/mozixa.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb787f8ae---biberemevefalu.pdf
    • http://xy-interior.com/uploads/files/202109232146502415.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=who+invented+the+first+computer
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615863ac27f05---kavokibipe.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_off0000b0a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A8 16792 bytes
font_01_sfnt_off0000c8bf.bin
3bc5a58083baaf6b93a77113b8c95844e3c5d300a75b949de12e31159bb10880
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 10836 bytes
font_02_sfnt_off0000e1a0.bin
901f617ded72f7236f542f9654e69dc74e046006007e22b3c97ac3e4da744087
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 14492 bytes