Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c961c28295bb2c0…

MALICIOUS

PDF

92.7 KB Created: 2021-08-06 05:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8cb71ead1a1391bfaaa08b812dbae33 SHA-1: 1cce3f6aa02fce09dbe96b59a419f6255bc07b84 SHA-256: 7c961c28295bb2c0b19441195fe721bd4cd114c03f36737a11a1802c43bf27a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://melly-incendie.fr/img_db/65916683216.pdf In PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/37508900283.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/34443775587.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jadik.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/09f6a2cc47ea9e66f0f44c28baa8ec92/roderapatimiluf.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607078877e664---zidifoxozuvikukimudopafus.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/darepanumotuzilexixotudu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/56981427548.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c2d51bb49---21850593644.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/vizodoxezuzoxigiw.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/nugodalapazabige.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079eeabaf701---88466550385.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/3527715837.pdfIn PDF document text
    • https://qnzar.com/files/vesed.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898029199d7---409869234.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbf7daa29---banela.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/rofixiganipoduforit.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb771897253---dolekapujinawebek.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fa2395ba---polalotikomefonibabur.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070014341a41---60872367361.pdfIn PDF document text
    • http://proxima-design.cz/files/file/62018243408.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/lezevolodogedefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sermons+on+repentance+and+forgiveness+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_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 16988 bytes
SHA-256: c13ff330d35013c56763105596540d8fe9e39a4ed3121d3ca2a75aab11c1968e
font_01_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 11060 bytes
SHA-256: c0a8e235936018566cad4bfa4e002d6ef9a63ae3d8a41d63a44f82a3a963bc21
font_02_sfnt_off00014ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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