Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fd1a676e1ca40d…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 21:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e3956e7ee0a3bc7e2c044ef4b4e9b51 SHA-1: 347cbe027a3ad7f7d34732719f401667de2bfa08 SHA-256: b3fd1a676e1ca40d7678b455050c18a6dec7254cd55743704955c7fbf1d8b33f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f3f5f1b4e---84653982340.pdf In PDF document text
    • http://toyotalongbien.org/data/dulieu/files/kuwebegemojo.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/48759207564.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/57593161134.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b288eda0a56---64117983896.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a3c8bed10da4fc34ac46b34ab1ec3da1/pupozu.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/ritubekolizakowuwiguruze.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c52965f0a5b---goxefowoxavomerusaw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/28759100331.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/malokepewemabu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/mokavidorexujofafud.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/56772916695.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d0b29b8bd983a1431fc97e661b0a0e90/mupono.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c8c0a710---1693109559.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a678c1942ff75dee3c595fdee572897d/74555976950.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/14132879684.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c3a73fecd60a1a4139c5a21e07131ef/baborotu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/25deb868f809c33e7cb770f4a56d2396/87957462079.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/wapikobijikoji.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d0e426a710020de98abad6d512d765a2/98762574921.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/88673167666.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c934205dd31---56071896122.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a41a4bea2d20a27a721153e07bfa2daf/96234300800.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gepiz.pdfIn PDF document text
    • http://vce34.ru/attachments/file/75609303261.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/tagasevolowaxuneretev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nursing+personal+statement+examples+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_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 18292 bytes
SHA-256: e9a694ca9feb315306f2420fa180d4f554eafce99305223c19ab8ae2b50767d1
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1C 11020 bytes
SHA-256: f540a3c3637082186c2732b31eb92b83bf0d54016fd3c701557ad31957ca28f9

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