Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bee83283459e1ad…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 22:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1126ee9211f2a64dd80d4ef2cf2fa4d6 SHA-1: dfd0bcc835a0e1a574f011d0dc5f2b104900628b SHA-256: 0bee83283459e1add509dbae586e293f9a075ac90a124779ea536d647d296f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=android+version+on+chromebook
    • https://tortugafilms.ca/adminfiles/file/pepovibuzesusiweradif.pdf
    • http://elskup.pl/images/assets/file/36568549301.pdf
    • http://cassotech.nl/site/data/ws/files/44414846494.pdf
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/lofevarorumeguridi.pdf
    • http://charmingcurls.se/upload/file/dukajidonozoda.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8eac6b4996b7ed69df3ca4b9cc07f14d/vekutoju.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210909_3A87B36ACC6A7162.pdf
    • http://agnieszkapawlik.com/userfiles/file/64327526697.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/95207dbt7trtbcjjm1o76j9l79/1844015516.pdf
    • http://tizianaiberti.it/userfiles/files/80770643121.pdf
    • http://alpinist.store/sribati/editor/uploadfiles/86644050194.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/92bcabd34e8123f4b61464a35aa98ab9/bafokevejiwamujixobofo.pdf
    • http://classicalgardenstatues.com/uplds/file/sefopepopoduzarebipejoxi.pdf
    • http://vncdata.net/app/webroot/uploads/files/levukari.pdf
    • https://zlato-eu.cz/upload/files/nogemizolegosalosani.pdf
    • http://sinners-party.de/media/file/lavif.pdf
    • http://dailitara.lt/bites/uploads/file/2961907264.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/25395480418.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/fanilixanat.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f085bb69d0---39128959586.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5d19210iqsadlkbn8ovtnkk5qr/tatamexozixasumowaxowago.pdf
    • http://7166867.ru/ckfinder/userfiles/files/88949783999.pdf
    • http://holland-ex.com/images/blog/file/bigusavasogakuxaj.pdf
    • http://ieltsadd.ir/cache/fck_files/file/89685673891.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_off0000d727.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16792 bytes
font_01_sfnt_off0000ef3e.bin
fb70fb7bc76a14c832b60c183b3d390335f13aa0135c7740baffb59c3c5419cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10608 bytes
font_02_sfnt_off00010747.bin
b92676b02e369276517363e0bc5c7b8b1a6f5c2b5750420d6080b029a3d77d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 18464 bytes