Malicious PDF — malware analysis report

Static analysis result for SHA-256 348fd5aa424624b5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 22:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99ec2b7101ffbe224631a3aa32814d4d SHA-1: 6954e9d269691a0c6996aee3042ad860a843a3ce SHA-256: 348fd5aa424624b5b0d4c49689e52bad6f88918a8550993714500bcb16104e4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ruxthai.com/ckfinder/userfiles/files/wifudidinetiladetusuziru.pdf In PDF document text
    • https://cartolmania.it/file/zazulapigimawamidizavived.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/74430874007.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece8bab38c---dinebuwoxewew.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/85096334666.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/pedaxi.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/suwizuforan.pdfIn PDF document text
    • http://labonscafe.com/userfiles/likarisoladifu.pdfIn PDF document text
    • http://air-con.ru/upload/files/27317801133.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/46026560893.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/bojowoforusimakome.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/jefivik.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72128561134.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de683ec72---20573606828.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8e42fe14---xofolusamawazip.pdfIn PDF document text
    • http://tfforming.ru/d/files/75673649338.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/62ob62e805di114a922f2trgm0/dubosapukebumasebim.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d256c4ca7d---dazode.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/33150219470.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/potimozix.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7891b5659---28194222782.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/36539478822.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/78743574449.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/37577121697.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/ririkodif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=words+starting+with+endPDF link annotation
    • 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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 17804 bytes
SHA-256: 46235b848cd4772b8b8a6606d94ca368c084a6f0ecd34b2be141c51804df1c9e
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 10560 bytes
SHA-256: fe91461827b1871cd91d2576c17166dd90f4a6b938a0dc40a6fc15799416c25d
font_02_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1