Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6031cdee2984c9f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 01:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b193b5eb11d0e489071aea7a4365612 SHA-1: c12689a2368e8b3c19d3154cf8066eba5bb22bc3 SHA-256: e6031cdee2984c9fe8f60e5380b73c96b6b499344a67a4fa6ae1134a921688f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous other PDFs hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sportsgarten.com/editorData/file/4008497273.pdf In PDF document text
    • http://wabasnb.com/files/fckeditor/file/84061288160d3cfcdce9d1.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/nilurosife.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ebb4f615f541f3c7dedff89327fda7d/19227864119.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b639faed1b1---bogodegawuresiwodowex.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5549a06bb---27921485232.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e901078a---29508033889.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e65fce22325b586dda3f5df4647dd008/22671394333.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/vipirimununize.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/44u70vd7kg73voqbkbhf7ck5v2/zodom.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/46358433893.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/giwig.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/95894731886.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4be8306c---kolugumumelumora.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8f134862---bupimamimopokapat.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad3g2f1f29amnra58avj2dkuhu/jakekusujiboretapovozupig.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/wawovili.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/dalefesixugewi.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/duzavopemujefufofixuwisum.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/41490420688.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/niladilisa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v80i7arorsa513vsd1n8td1446/79222280617.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/67433706233.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/34746535428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=connector+words+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_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 10432 bytes
SHA-256: 93f1566de52460698e5c423c738c6fb3fdc6da50183d358dc1b1bf951e869738
font_01_sfnt_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 15464 bytes
SHA-256: 3c83473d7c6c6f59e8ae43e70a8bddab62902c99d5ef92db1bcc8fb7aac0fe6e
font_02_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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