Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07b98d08aad2163…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 10:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 728c4e7ae3552398d8bac6bb2893ad98 SHA-1: 24e188e82e7de3ff524dc3a5a54f1ff5feee6deb SHA-256: a07b98d08aad21639456df4bbbb1dcbb1fe793686c6a104a805ee8e49f97f657
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. Heuristics indicate these links are used to redirect users, with some specifically targeting compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=scag+v+ride+parts+manual PDF link annotation
    • http://av72-reklama.ru/userfiles/file/1626723141b0ec850a34c85432d66.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/gavejiw.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/29011880251.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zowewowilozisulexisoka.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/77357137968.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/xekikedasopak.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/56990759622.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/fogiserikakubajideki.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdbad4a9d---remadaru.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/winisilovitolamiriwuzige.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e043bbc1---dilopulivumirunolusakazus.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/81198791878.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878ea46a508---62769915397.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/34194955133.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/viguboluvarazogatixoji.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/41192687713.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/65539176428.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/mimerowisorasoziwogegi.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b093d6ee783---49646623659.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/nunezoduveraxuzalos.pdfIn PDF document text
    • https://senfina.top/uploads/files/wurow.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 17180 bytes
SHA-256: 9df837776ea99e777b1b8e4bd09a1f6ea079aacf5343711dc96bda23a2f4d57e
font_01_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10980 bytes
SHA-256: afc78a9489d92e9369425a8015379c9a9d64f1819e3d6e66734f800c90a01b6b
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1