Malicious PDF — malware analysis report

Static analysis result for SHA-256 691ab8893246645b…

MALICIOUS

PDF

72.4 KB Created: 2021-10-09 22:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7972daecc57b85d30096d256756c2394 SHA-1: e5352f4c1c0be450b3771d2d8fe6cf68a9d58755 SHA-256: 691ab8893246645b3079b37aebeff24d1c374c4525337177761e0b055681273f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. Multiple heuristics identified it as a link farm pointing to potentially compromised or disposable hosting, with numerous external URLs embedded. The document body is unreadable, but the presence of these links strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://winstar-tools.com/UserFiles/editor/file/31145357034.pdf In PDF document text
    • https://akonis.ch/userfiles/files/tamigegewusogafujiwewos.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/meriserewup.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2c5c91534---85839034019.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/95022668374.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061206421122.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/govusup.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/51582011101.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/67569077504.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/kekomejumojeweg.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/72094127084.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/musetovesikat.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/7683493022.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kirosinonebebixosubaxosev.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/61788041348.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/88578875028.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-21/20210921113342239208.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/pifagoxuzivakimexetinat.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f616746c79---nadijetusenetu.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/zirafubukopejugezit.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/82256499832.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/begodavawu.pdfIn PDF document text
    • http://4rrecycle.com/files/file/surusifu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/dozizigololix.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c695ea7d5---79618025999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=artificial+intelligence+with+python+packt+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_off0000b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 11004 bytes
SHA-256: 33f2b951a082ae22f604a6ac25ba60ff716b74e8bec2af1341d496f1e06708f2
font_01_sfnt_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16932 bytes
SHA-256: 264b52ccb71e30a608c004d66598836581207f5996827a6772ed054c5bf4b52a
font_02_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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