Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d30f7b82f1bd92d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 20:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 09eb0c29f992e1c823aa6f9891f7a0f6 SHA-1: 7be5754632fce2cefb894a36f104038af8a05917 SHA-256: 6d30f7b82f1bd92d061aea758b4bfae39f91d8da3405003a7ee7d849a247b5ca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://kibbkw.com/uploads/file/62139924256.pdf In PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b207042e7e---84165123321.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075467e46737---99384207605.pdfIn PDF document text
    • https://fivetc.net/uploads/files/58767878541.pdfIn PDF document text
    • http://adria-ex.com/zafiwoku.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9e5c53ec2eeb0bba13ce05c62428670/20481725866.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/deraxilib.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c4e0f82fe9ad9498f3748a4312e589f9/tufaxajuro.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/sixakolidaposinuzowike.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d893e0f6ef---60945941092.pdfIn PDF document text
    • http://juentai.com/userfiles/files/24508130241.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wetowilunuz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3640dcf67d---78897651314.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/79764678046.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/90f6e1759962b36196ef5bbb73b30ef1/koxunatiginopusi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608297abd0373---14503001273.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba7c571fe---92843897783.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5bd7606320c537460c3c9717373df7a8/93653174660.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aff3329dc---xibudonogukejugekinipag.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/79724196616.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kqa1qpbh6spfaapn7j0bkb2465/rililojavuzixexuboxagivi.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/62368353567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=oral+expression+activities+in+english+pdfPDF link annotation
    • http://unr.edu/homepage/hayriyekkayih[at]unr.nevada.eduUniverIn 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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 17356 bytes
SHA-256: 44c959e1dbe308bb11a99afbb9255250b7920d562635c317f3e4ac77754d7dfe
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 11092 bytes
SHA-256: 50eaf21af6e93e535bfe3ba1bacf389ca7d40a5a193f99e67edcbfa1eda74e07

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