Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60758ff36b21961…

MALICIOUS

PDF

140.2 KB Created: 2021-06-26 23:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 93b9bdc38c876ccf1f12116052f9f3c8 SHA-1: 3613f4e4fd55abaeabb8e6b31a4a7c765ff5433b SHA-256: b60758ff36b2196159e93b368032b28efb7503867d6859b62e4ad03d3f2fc589
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The primary goal appears to be leading users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://wastran.ru/uplcv?utm_term=undertale+ost+his+theme PDF link annotation
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nt98epk2v4pesn6d6sfnqnsk71/fujixijidinume.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2ab84429---kuxiw.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/43898871882.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45640a907---98084317092.pdfIn PDF document text
    • https://capecoralliving.com/media/file/metozoritowifapo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737260565b8---34791169304.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/vefarekojur.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bece7321a8b---55538716303.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c68c551ce44e79582eceff512a3c6f/gazelutiku.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/31816474446.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4154037e---jalimefavoxubosuwi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/819b7c36aacf77e3729d122fb8da7270/fitavudekoxarog.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68826a354---mezudokemoxoroz.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/ninavatalopifuzefuwab.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076613251257---63087776357.pdfIn PDF document text
    • https://ivanamihic.com//files/18420928948.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bimilasonivagevas.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e4ce020---napujudibogufuzisokovifu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/36297695387.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_212948.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0b1be8857a2f34b53e985e25f4434c76/tovozudakonovedivagagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0e644138---44498017463.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 19040 bytes
SHA-256: d67165efdc3f228cce9e5a6788d8b735e41535f9c630a37bb56f0e2d63362c2c
font_01_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 76828 bytes
SHA-256: fa15eeeaafdd4fad1535404bd81bec2a1132cd20b573a41d97c6f6cad35ec1cf
font_02_sfnt_off0001f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BD4 10520 bytes
SHA-256: 749cf4aadc01711eb6e2c3cc3a29f7f2e37a65fbed359d0706f279f3f8037a00

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