Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e05cc5ed6803024…

MALICIOUS

PDF

85.4 KB Created: 2021-07-31 19:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a9f10d151e560595807f381c82e8666 SHA-1: ac6bbdda35037875130aa9dff9c8f5ff32cd27a4 SHA-256: 3e05cc5ed680302458627a69f6f062502de41891e23b905f320af6c7715a4ed1
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to domains identified as link farms on disposable or potentially compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, likely to manipulate search engine results or distribute malware. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://thefertilizergranulators.com/d/files/93185268602.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58636cc56ab24ebdbfc4a20598d22fd1/46006421698.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/121420138649.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/petup.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785cb16e2af---bewipodozijulav.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/fovawigipijidademu.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/21423589482.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051823441080.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/25941588668.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/rezorafuvekupi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b283574288a474a72826518d3569fbe7/fusawakumoxifemagone.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/sodetavovusakej.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/11d8b6439144131b37734184ea8581cc/38677808070.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078307a08d43---nekef.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/biwefibew.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/befasugarorezaberiwera.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mulugebovakog.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/11768483572.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b7p11138irlf1ktoduf2d76mi/nulixidakaxe.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/28371231280.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ee27d521d0cc2e721a7f1f662c32d1e6/56139666800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fast+and+furious+8+mp3+download+songs.pkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 11412 bytes
SHA-256: 20bf1dd9dab891ae7e4139b4500b25511f302fea0fcf54c7f34609b51511b3e8
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_03_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 17580 bytes
SHA-256: d6a7fb42f55232bf54892157343791d214d0054053c675c3d84f36cacd7f4d88

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