Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d67455eb8e1454…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 931ce4780f171120ff32f2504f464815 SHA-1: 7cb660368127fff8db769b4e265ddea430616403 SHA-256: 28d67455eb8e14547f6781a22b763ff05a633c564ca33d89e684ee75be265493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure points to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://krisoc.ru/uplcv?utm_term=shakti+serial+episode+204
    • http://sinching.com/uploadpic/files/202109040253091095.pdf
    • http://rent2day.ca/ci2/userfiles/files/36881677474.pdf
    • http://thucphamchucnangmy.vn/uploads/files/jofiw.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764022b6f397629dd37baf00760cf9d9/14288605416.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210916_E4C1B36C119DD9A3.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g3gmd35fsbqrn3rbhrog8b27mb/28604805868.pdf
    • http://flamefitnessstudio.com/cewit/images/file/5263751731.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bad138817---tuxanafe.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/70091857382.pdf
    • http://sushinamu.com/uploads/files/piguzizovatuzezezes.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/79318711041.pdf
    • https://ehlibeytalimleri.com/resimler/files/jiliweliravapuwera.pdf
    • http://tidomusica.com/uploads/files/202109041128338924.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393ff8c910a---dabaguguguke.pdf
    • https://rapn.ru/ckfinder/userfiles/files/91601033306.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/vegaxawoxanumudiz.pdf
    • http://baggiez.net/userfiles/file/buxodezewav.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/mijakapijetavot.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/pipobopiwigusozeni.pdf
    • http://www.hgekc.com/media/userfiles/file/tujomuli.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/jowelida.pdf
    • http://bkdesign.ee/userfiles/file/28027003723.pdf
    • http://boschvietnam.vn/files/usersfiles/files/gosetifatifo.pdf
    • http://enricobarraco.com/files/pivevawepiradix.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/73291317423.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210920_4236993894C517B6.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ddcb3dfb---zaran.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad030a3bf---vomaberamelexugakiji.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_off0000c6b2.bin
dbe52ef97971554b3214ac519b88a50f95e0bffa5665a369cf2011a405dae43e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 16856 bytes
font_01_sfnt_off0000f259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
font_02_sfnt_off00010a70.bin
61fb94c1b8ca588b3c0f9589fac06fd664bffafa1e2ea5a889b0d3e854a7089f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10872 bytes