Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8092b0ca0d23d00…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 17:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf625b9cc53772af7a5a079ae2a4e0f7 SHA-1: b7652b5fa8e259622216274be23f5220d76c921d SHA-256: f8092b0ca0d23d00190b8dfe4686b31a6eba90cd7fe58286abb2c4f80f7bf62a
156 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure suggests it functions as a link farm, aiming to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=easiest+video+editing+app+for+android PDF link annotation
    • http://vsrru.ru/userfiles/file/87284581268.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210914003630.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/xuvejagawo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422c20d6257---6447902198.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/wavebobimebijuleb.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec165111ce---93576086634.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/fipadegugatimip.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/xeduxegalug.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/42286999762.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/dosupuvopajojet.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/tivevutajixi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/78262741709.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66217621057.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/gezubevibovesuwiwuk.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/53357270142.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gevujabudofamomi.pdfIn PDF document text
    • https://adci.vn/data/upload/file/xetifugomukinozal.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/lafuni.pdfIn PDF document text
    • https://csn-alliance.com/data/files/virodivivud.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/pefipukigiwopusematuzukub.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k0ibpktumb0g68tldsubq78a07/mezinozomox.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2972cefcba156f883582fcea5e8b816/3148754771.pdfIn PDF document text
    • https://shunnasato.com/revawikuvajoluvudugok.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/13651587890.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a82fd543526a8e098c38d9657454fdab/zanuwunuderujagirezo.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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 18716 bytes
SHA-256: 577685f1a965d0df0b7fccf83a1d53f8e376855ae129cb9cb67dc49a94d43e3a
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 10676 bytes
SHA-256: c9c7487860e49606865893c80dbc5d3b711866a6afb57aa41e64f588ac3e80d2

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