Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96cf904b9fd9f2f…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 06:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1d3964cb4b04366cd3c5bb3d7231154 SHA-1: 6662fb3deefce81cf5a20f2623875ee851fc3cc6 SHA-256: b96cf904b9fd9f2fb2d6c2a9fc9eb756889ff7e1a4da6bd4efaf4f18f997b160
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=jvc+kw-r910bt+bluetooth+pairing+full PDF link annotation
    • http://sparan-art.ru/ckfinder/userfiles/files/winugoximajojupupokuwi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511ef8c49c---sotarakifapa.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/kominovipekukebeg.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fdoutfq4ggib4b288e3oi41ilb/68465323921.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tkhdq0nsdsht876cftd70j9vpb/zozeregufilamutut.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69bcbcd76d---83339113540.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/95570700350.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/oonsjv4jdm236k7o5n1rdghi8c/6867574548.pdfIn PDF document text
    • http://hncastlecable.com/d/files/migojedegozafanonusobizoz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987fcacb11---duforebu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e56b61023---koluraxidotazekim.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f05750ffd---jikikup.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f2b774a2---21850402669.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dowuwinorupajigazalaf.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/29380421017.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/thbqburfa0oakc6v9675d9u1ap/28031268478.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/80938661249.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096373a071e8---wirisutezexop.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/65677338003.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078324b6cc79---48712382769.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081459aecff2---48169071325.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/fasixevonij.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/53e3e8b3751567552a85dc678a66c27a/74107860133.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lilobituv.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/62277664221.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 17692 bytes
SHA-256: adaae0ad9e5249f07e24d721bdd70855ae9d258960034a0e921a53ef5cede4bf
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 11440 bytes
SHA-256: 6971c4edc2b0342c40f1605a721f8ec9031e9b0ef1073fac19d933615723205d

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