Malicious PDF — malware analysis report

Static analysis result for SHA-256 4677da9a345d6041…

MALICIOUS

PDF

89.7 KB Created: 2021-08-06 16:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6dc15e35c82c5210c5af9526247c906 SHA-1: db7a2f94e29e7fc1267c5317a5dd66894165b15d SHA-256: 4677da9a345d604133a32d8190e458c1df9d7e5dfb974ef3d7eb32df367d1049
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to distribute further malicious content or phish for credentials. The embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://congnghieptauthuyvietnam.vn/upload/files/sovedapuxugeru.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/dfc80f5f75598b57458ddb6be53e6c72/turuvanegavikabofifenux.pdfIn PDF document text
    • https://discoverthesky.it/file/jovofadosuwibo.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/bivamavaponilapujuk.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/61671182782.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/70573828161.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4da3896df72e02fa225c47948b7cc557/pomatakav.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4a1d9f4f8109d192c86c886902bda1b6/68838047547.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/35755510426.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-26/20210726181307832575.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8d9f529ba3238a06563453bbc6dde4c5/84894065587.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/petunavuvojakulibufabemaz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e34b02f17---73077754180.pdfIn PDF document text
    • http://progetec.org/userfiles/files/difagaxerofovevoxirupanu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a4550cee6---27987434169.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/wewurafuj.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097227c8234b---tazepipuzedawefavulizosom.pdfIn PDF document text
    • https://hgb.se/filer/file/90544742794.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/82696212978.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/lomikigimajupibimeviba.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc645007b---68445513826.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/86812999015.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af8574f59---2376585286.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/23521522287.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/46149678205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=topsy+turvy+planter+directionsPDF 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_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 17752 bytes
SHA-256: 5c08b117b77136458241915bcc8962371bafcd9d6abbe7104429d73380de950e
font_01_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF7 10752 bytes
SHA-256: 6771e4e431ceb9d1eff5c68f103dea3498493031232e5586b1e622f281d283c0

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