Malicious PDF — malware analysis report

Static analysis result for SHA-256 396a69a28f808bef…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 13:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a4ec285b98eb5f4cb244f3cbc8ef28a SHA-1: d4af229ccd1472dc06a769f0c086a8efa27b3988 SHA-256: 396a69a28f808bef26b1ff4b270bb5e04323cc753ed4f0deaeb86fb8694a852d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=2015+honda+cr+v+manual PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b577e82513f---86365121149.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/35884078118.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ec07878b01dbf8d2945a2edfb23527d0/40936949960.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee8c7f9e0---kusezegulim.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/rd0ahif23etl8tb95gjsl0586c/7000035235.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608851427d5b3---27382715517.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a72c1917d0938f4a1be864e1ce05d625/fivilidagibuta.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/49629354974.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/37298326287.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/tulovevokadalisaz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65b5b4c68---95551256867.pdfIn PDF document text
    • https://energooptima.hu/upload/File/72502485220.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/gcpacurcsq017q61hskshhoil6/90715441673.pdfIn PDF document text
    • https://phunhai.net/upload/files/xazukebexosun.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e7955821d0190cfcf7d9b9ffbfc9dc9e/74664410319.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/56800681116.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/21539734704.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/34904129499.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/zixosubodibol.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b733d7c081---nurasig.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gerivuzetubixivibon.pdfIn PDF document text
    • http://dd-eng.com/files/files/rubozedaxa.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6caf168b7---6865406244.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_off0000bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 10640 bytes
SHA-256: 57fc82811cc221e14424ae9ee55052090c9874def080bceea6333d4d0299949d
font_01_sfnt_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 17388 bytes
SHA-256: 3a7405434b546d7793286d4ed9a25d24cf4735a33f7380f1b2eb4929854da32e

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