Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d664470a963fa50…

MALICIOUS

PDF

95.5 KB Created: 2021-07-14 01:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 046784cee325f0e36d8f5501ff4a2fc9 SHA-1: fd22babdeec493baa8f9afb4be86ddad2125ce05 SHA-256: 1d664470a963fa507969df3b10cb095f2312b913005822b4ddba144bfef5096a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing attempts, consistent with a spearphishing attachment delivery vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://montaze.org/democms/userfiles/file/70156746198.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097f79ebb67b---gugulikobosogokaza.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/53aef6a75521ae8831d9d26c7e6fab7c/bumutejos.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ac188dfb34aab750c10cfa1a26121c29/87273986020.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/81500256831.pdf
    • http://fine-cottage.ru/userfiles/files/jafuvesajibomo.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9b33fcd682c28d3cbb1153ab2c864455/23676747511.pdf
    • http://connect-senior.ch/uploades/userfiles/file/74695935182.pdf
    • https://ms01bet.net/contents//files/pamumevopip.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d793200e49---voroxewamimaluratem.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/55251916145.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/p52b211rb7l41saf0jdjgfimtc/logobajejasotukowupetek.pdf
    • http://applexin.com/ttpsea/files/file/xunokinegi.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/j3lc9nmngkps5uitshrrs8uq2e/29707461042.pdf
    • http://zetrade.cz/userfiles/file/muximatepilasawovulu.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec49bb5920---30508776058.pdf
    • http://vieclamquantri.net/upload/files/zowuwivarufufokudopi.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-13/20210513083405109597.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa55c6be4---41341494615.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f427f6321d---27619838814.pdf
    • https://akproauto.net/nbloom/fckuploads/file/92728116526.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcefe427263---14672805327.pdf
    • https://burstallconrad.com/editor_files/file/fofubunalawuvexapi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=symbols+for+journey+of+life
    • 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_off0001106c.bin
af90270f03380b5fc403eb6d4e411f6469df7699c5f961f7923c6ebca010ab8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10676 bytes
font_01_sfnt_off000128cb.bin
31297005ff3dc18bb4101d74586d7e9143546c37f40c9845021fd1060f03792a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 17996 bytes
font_02_sfnt_off0001576d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1576D 16792 bytes