Malicious PDF — malware analysis report

Static analysis result for SHA-256 86639f77d9553a13…

MALICIOUS

PDF

100.7 KB Created: 2021-06-06 04:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 43a08420b8cd4ca74b70520fce50b6cf SHA-1: cdcf527bade0ff9b45ce3a854ca188dd6c99d020 SHA-256: 86639f77d9553a13e66cb04bfb18af38a487e09328b1766a4c8af422bb404020
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain metadata related to its creation, not user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://archism.ru/uplcv?utm_term=how+to+tell+the+strongest+intermolecular+force PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/74bef7adfbfa517cb04cdd06f6bfd27b/kemozuledosomedudotubaso.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c552c66c2e---vagavejejivosal.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d8bdc3dabb5735bcaac7386b1688c40d/bukemuxolopukarozos.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a50dbbd6---65045972655.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4273274c55c864ec184049feef2db52/86048177653.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1691fe8f---fakixebaxodutubono.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fhlm12ibbvdt84l4nqblsomvv9/mevopedogerese.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8846626e7f4981d55a98df47e2c2f82b/99783003378.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087995bc238a---zalugatomaxanorusen.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de122f3149---38742357202.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503005133614742.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/52845642824.pdfIn PDF document text
    • http://ezibra.pl/upload//file/wizofugij.pdfIn PDF document text
    • http://bakoca.hu/files/file/teforopagitubatebimudi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609095e01d1b5---75393293613.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b803ca750bd3e35c33d98776ffaebb9c/masalug.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/039f0754e64e1ae2e0672d1c262ce8a6/pixobeburig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00013715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13715 5348 bytes
SHA-256: bdf6783a6e4720671cef563053b96771029d4b16b95cc883b1757b6bd1a156f1
font_01_sfnt_off0001492b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492B 11236 bytes
SHA-256: ab5dec7daf44dd38263787afb66540a4e37098968f2591d865e16f5968ae278f
font_02_sfnt_off00016fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD7 16260 bytes
SHA-256: a56c3305eae8c274f9530afc53b94bb11aea5b2e4106fccae25e6adbba8aa2c3

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