Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc79ebc21d50c7b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 12:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbdb65ba388b82501bc331e635a89d66 SHA-1: 09c3f7f59cb3cda1b53b3f1514ab588337e47561 SHA-256: acc79ebc21d50c7bbd63db01efdffef49a65ed886dfe7581e8dfb14b87f012e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely part of a phishing campaign, potentially using embedded JavaScript to facilitate the redirection.

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://cructi.ru/uplcv?utm_term=text+to+speech+tagalog PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b4b615d---51103810997.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/85036054796.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51268dc9a---15357643663.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210904045739.pdfIn PDF document text
    • https://stotex.rs/files/wuxenewegejomid.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/29390725956.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/pomizibesekopalobalinube.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/42766556917.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f18697c3---bonezipip.pdfIn PDF document text
    • https://ocw.tw/uploads/files/pudugepawanofikebesagipo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/52241942684.pdfIn PDF document text
    • https://actor-conseil.com/files/file/8964058369.pdfIn PDF document text
    • http://futboltotal.net/images/files/xibejon.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4f0f5b2f8b62dcdae4c38b7f0d2a5c74/vesidiniroto.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/99033382051.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/fififeginonatowaroxegodop.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/melotuzovefim.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pilojinaseragotujo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee033392ed---90874262715.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/67848984773.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/ladawuguvitipegakopezonod.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161469811f21c7---monakibug.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/46447543281.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fbj6uuepae3033prgb9d2rs14c/41729780105.pdfIn PDF document text
    • 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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 17560 bytes
SHA-256: cc31fe1a85920eff923815276de51007ad6b7b6262d878a83bb11c4f3c0eb5aa
font_01_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10424 bytes
SHA-256: 830a1a968aa4da65aea071fe47a967f575da38b3282c8012883eb70a2001abf5
font_02_sfnt_off00012e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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