Malicious PDF — malware analysis report

Static analysis result for SHA-256 168e87741056f083…

MALICIOUS

PDF

90.1 KB Created: 2021-07-23 16:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc3454c4340daf57a7e9a5f920d04269 SHA-1: 94b308a6a94bc9879cf383c4fef11d19a1c6ea94 SHA-256: 168e87741056f083a0e0879b6a3018292689000967a5b7132e4df5564e240960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malicious content or visiting phishing sites. The presence of external URIs and the nature of the link farm suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://bazis-expertiza.ru/ckfinder/core/connector/php/files/9433343062.pdf
    • http://grafiport.com/userfiles/file/gejabetib.pdf
    • https://bdsvieclam.com/upload/files/48121227768.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9cf91dbe---48608682176.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff4c91e57---begafa.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776e5cdeb4d---kifisusisev.pdf
    • http://dotacjedlaoze.pl/userfiles/file/22167154275.pdf
    • http://www.bluewhaleline.com/image/upload/File/lixugafazu.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4712e9d8d4---detit.pdf
    • http://msamericapageant.com/clients/873634/File/woxoperukesuf.pdf
    • http://portalcom-b2b.es/img/user///file/_0620464001623231154.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/mmq2o8f09tsp0lvmldvk3hatll/43118667298.pdf
    • https://groupunsur2.com/contents//files/73927924371.pdf
    • http://bscartridge.com/pic/10248613394.pdf
    • http://botosani.ro/img/uploads/file/pukenurumenajopa.pdf
    • http://pololanna.com/user_img/files/36789534729.pdf
    • http://versobrokers.eu/userfiles/files/narenuradonufena.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afe36de9ff3---65843141852.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081accf4b001---97591999772.pdf
    • http://pokeocncafe.com/uploads/files/78267308877.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b5794fe7---kivixuf.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3dfc89b2f6b9a9baef6bce0e9cf7e05d/97373341543.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5c0f1f8e5f93e140ac1205d6d896427b/salexewabotezosomewodabiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+el+juego+de+purble+place+para+pc
    • 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_off0000f94b.bin
c2676ab685c7392bca5c4eb72bf690616c1f953a12461e3b273ee985da4a5b92
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 10768 bytes
font_01_sfnt_off000111cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 16792 bytes
font_02_sfnt_off000129de.bin
804be1634991d7385c30865fdb72a42696f1cfd18d16d3211691ce564f5baf5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 18512 bytes