Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b59e4d6cd94d0f4…

MALICIOUS

PDF

81.4 KB Created: 2021-08-19 07:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 227725266402a6a8917efd95e78c3e88 SHA-1: b32144ce4db964b0e659fbbdbca9850abfaeeb99 SHA-256: 7b59e4d6cd94d0f42db69885133aa3fe8ed56db9cffc9ab32c313be098009537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The PDF structure and embedded URLs are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=what+type+of+heat+transfer+is+a+stove PDF link annotation
    • http://www.companyforte.com/imagenes/editor/file/wogiwelagofoxixir.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/48577932932.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d83c6fd8d---vetuvin.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gadokasade.pdfIn PDF document text
    • http://ashioke.com/images/library/File/dufezuxoze.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0cfg91s4v0uf6jv2o1p2ob76md/kuzakej.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/57692103877.pdfIn PDF document text
    • http://erex.hu/upload/file/99399068743.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ac19f6a6de8a2f880acfbafc2ddfe81b/tawatomufeluxulixuva.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/88400927378.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gareregikowugatugaji.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/debanaderodevibugaranoga.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4c4643f097e44a4b9f04b3757e7b2ccd/33192727436.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cecfae8c9e---72913263128.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/nusezowojatepaxa.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lebadojanonuro.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc55a635a9---wusave.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wuxewegewofawenajipe.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9hiv5p2nu617ojgaoknqqqf00m/43646270646.pdfIn PDF document text
    • https://hgb.se/filer/file/suvoxozifudigesos.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bhj6cn724ie3647m8977gmfkm2/67497247952.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607defd17094e---11954222654.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/38804123280.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0a316d3adbed862a895c6c32d01c187e/36915995754.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xofapapitirewumi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9edb4bfdc2553dad29ab935f8c104bdb/lovobenutab.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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10584 bytes
SHA-256: 62f7319e75a9db04e6467637e008a0db6dd629efe35e340364c7e6669ff3e818
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 15744 bytes
SHA-256: dc63a6fb057ae48afecc88e04938dcc122481fa90ef295a52c39766eea44ba25

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