Malicious PDF — malware analysis report

Static analysis result for SHA-256 61783150bfa13dd4…

MALICIOUS

PDF

84.9 KB Created: 2021-08-22 01:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f0b2c985f66bcacf7ef529369baf8d2 SHA-1: cc43e830a860cbbd5da4fff0e9a6ad90d2b753a8 SHA-256: 61783150bfa13dd495b828d0874d4e3ad1c41a8b9514bd95ca92ce2fe5c47237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://inbeeldt.nl/userfiles/file/teruzixutako.pdf In PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/37423026217.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/vupatuwa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda8cd3e2f---vawinoririvudug.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/3137f6b8f9b5c84748345d2ab7afba89/79207248877.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/40152471361.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/37497557075.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/47183234046.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/15911365935.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8pul1h14co992959r7rhvpm1vi/mijukerosi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9628028b425c9f611883fa334ffa4a2e/dazaxosezalatijiroten.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/170b21f21bfdd05c52a6965cd2b346d9/35662473360.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/vajiwufiwugo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d4eda5a2---67001532143.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5751b39bbc9985508631d301484597ec/zasiroborusatuxu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607854d1925f8---83434282712.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/lujafazaropesofibe.pdfIn PDF document text
    • http://zerosquareonline.com/file/99798226420.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/dd76fcb9ac5a96e76b9e70c43d11c999/2009755666.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/ropudabixi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e63df6e0---lopamide.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/gadilusenamezitom.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcfff85c9d---11087808887.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/54984716759.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/66966419936.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/dararalikawujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fredi+wifi+camera+setupPDF 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 17288 bytes
SHA-256: 14018349ea48a7156416ba24ef90b71d3414a9678604a2259cdf4dd5755dc5be
font_01_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 10676 bytes
SHA-256: aa630c3ee6c791ab0649bbd985fc285c8185bfb220d9a7e671f8ffa06118fea5

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