Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9bc0549ac8cce2…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 15:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5e6f4b5e1564c9870082825389ea112 SHA-1: 94f2c38f6d16188318afebad8a6f08ef318a6ebb SHA-256: 0b9bc0549ac8cce2c3bd9f56e30822e6a05388744e35083de83efaad1d6dfd8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=anatomy+and+physiology+of+farm+animals+8th+edition+pdf PDF link annotation
    • http://mini-garden.ru/userfiles/file/61498641507.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/910904300477cc1232bb90259fffac1d/38968579157.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73338231004.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/47179144927.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/g5593mgvc4s569k5s0tjqn45ai/1069609885.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef2fd052ad---jeditowus.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/pimad.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/38855a721d707ea21b641eb18e563691/47173177173.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b311f2a742d---77044343007.pdfIn PDF document text
    • https://etadelloro.it/images/file/94207219131.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5170aa7602242a85b5101f3871bbecec/66596617263.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/zikotajapeja.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/73735862782.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kad18uusfjne4o4mm5tp83sgjt/76143181003.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608445dd307e9---47118483988.pdfIn PDF document text
    • http://mesterek.net/tmp/2592273708.pdfIn PDF document text
    • http://come2menorca.com/images/file/zazale.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/dutogudi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c842b7babacc95230dd89f4b53956b1c/libutija.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/59459091397.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b151b270a---36947338080.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 15844 bytes
SHA-256: 2925fcea21fe8a7df357e26be7458564b65e55b7a7fad005b50483e5ef880a5e
font_01_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 16460 bytes
SHA-256: f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 11248 bytes
SHA-256: fadcedc30b303996e7f19ee5c70af70bbb6ca202884c4a20cee4671e8a8ba5ac

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