Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6febd7950825c6c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 00:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a16ce98f3aa89da96e57444933eaad6 SHA-1: 124316b04d1eaf73abd1d686a8cef07ab12dbbdd SHA-256: c6febd7950825c6c035940b3eb3b957d070d4832bb0b4e9221035d3957568709
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107546b765---11498381805.pdf', suggest an attempt to lure users to external sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://quangcaowebsitecomvn.xemlaco.com/uploads/files/87998797796.pdf In PDF document text
    • https://mldom.xyz/web/img/podborky/files/30756803183.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/61304365068.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4f18d44ad1d21ed799d6cc351a6f56a2/robudegonapiragoz.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/77665697915.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vemozojaratadepelura.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210901_8F6E4013A532A713.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/kamoraxutadubegutixebonel.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107546b765---11498381805.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/bodurelefako.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///13265205414.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/78906617593.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7feab2c2cd821ee3935d3b7554614a81/77936917275.pdfIn PDF document text
    • http://yoron.net/up/files/55018403098.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/70779885170.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/kisuzisaxatoxerosotux.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/tixefinutovusixovodufe.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jevaserifobopipiwowimaxas.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/86462461508.pdfIn PDF document text
    • http://trevorhannant.com/nedigokesegi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161394c0a48e15---wuretekude.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613964b292446---10852769965.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/42373424063.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/73256192953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=awesome+words+that+start+with+rPDF 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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10432 bytes
SHA-256: ff41ee2ee982ba934791fe609361c28355871e09975c6d79b92692f4fa8fed6a
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 18732 bytes
SHA-256: 54594eed722fb57eef44ea52e2da6bdf238c6c385b5db2a3094af247075b25cf

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