Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6f8b54de2a4e55…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 00:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67988d71d96a69edd87f1b4803764e83 SHA-1: 675b4889c2f7548b10c3393b832f4af415656402 SHA-256: 5e6f8b54de2a4e554ead7f2f2323f460998e5969c72f79642b38319b4a648a6e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=rockshox+pike+2015+service+manual PDF link annotation
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/oq982hpe435s6806h9fsthpg12/riwodusifufudo.pdfIn PDF document text
    • https://qnzar.com/files/kopedopemujunidogimab.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kasurageda.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/306987e037d7e81dd1e0e02ecac7e78e/55174194225.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0606729a6ae35fa5695a5ad75a8dcd07/wuzinireseketawafu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/renidasofukagopawame.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8ca7d1c687fef59aacf6fb0bd5a0bd11/xawop.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/febujesopidekafokef.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1e1cfd34cadc228465435af8ffb829ba/7513558745.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b7b31061---pelanojexidin.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1d863026---lijaxoduzedipesola.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca57f80e38---59507535015.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2fb5e645a---rogunavokanilegi.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/numilusedi.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/xokiselezuvulexesufa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3c939fdbf---povifopudewubobigesejos.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/31189087821.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/23654354582.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xofivu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/bamawuxemedefogiva.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/38658503124.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202108130355186459.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/siwora.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 11372 bytes
SHA-256: 16f07b875c17ff26d988dfd1e77daf29fa3de7fcd5955f24b63a94fa3efec402
font_02_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 16628 bytes
SHA-256: 4fd6d1a98fa5d9b4244152f34d2f6540b1375aed0e6c21c549ec6feecc2e4603

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