Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b4844878d6cca7…

MALICIOUS

PDF

106.9 KB Created: 2021-09-03 07:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 50d912714da53ecbbd267898622c3285 SHA-1: faacd638ab59c8e957aa0a98781ec04bef53d57c SHA-256: 86b4844878d6cca765e6a139d8001acbcb48e45a3122a4b0a152620e64ee0e8a
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://cape-electronics.com/media/file/58787187216.pdf In PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/44190033140.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jogebesamive.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/21267835975.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd07beb5e---15715791138.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/46896118747.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4bb72040cec952934f2ad2d05adeaa97/wopenalox.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56dafd6907d238e1f23bfa5146ca5a03/91437212785.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f673dae42060768f9ada58b59b11bfeb/68659200304.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/16829203424.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/kamebabefolopegudox.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/45005043831.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ce76bea917136d66dd9947560daa871a/67116418967.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/44936170384.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b058401b---59083739346.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e89845651c---93530432610.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59fe6f0cf3---vivazavutonudepuwatu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e54d62f2eb9aad0df03b31554887c723/56100736976.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ec6bad078b---majiwunonexavupolelutof.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/22003122770.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/9356938412.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9e005be7967b68ea35b59422b49c9d14/silopabuludalumovi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aaad8536d9b3a8439caa257296618109/sibowizenerisero.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d798d1b3e---36620623067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=legge+104+del+1992+riassunto+pdfPDF 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_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C3 17708 bytes
SHA-256: d371d7a8bf6542380199faea86c822e2a7c0422ee99dc65f7f828c0ed711b064
font_02_sfnt_off00018206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18206 11272 bytes
SHA-256: 8333a18cec4cd306b03afc85a9ee35ec162341011e3fd8323654c3e184c967dd