Malicious PDF — malware analysis report

Static analysis result for SHA-256 491740ef00aac61b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 23:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0836672e63a172af75703d9b3e1c606 SHA-1: d21d5d31305ee96651c3cebd5f89f1d51d408cfe SHA-256: 491740ef00aac61befe10061044a865765f149e236033c9b95b5cb78be78b960
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. The file's structure as a link farm is evident from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fotobolfestmeny.hu/mvc/userfiles/file/75057818231.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tj9netqaoabqsd0b9cdhp12p04/24101410492.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/69104921399.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4cc13443990ca85d4b38fbf7688b7af6/44717753497.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f531ab5d26---24261796948.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160767f6c457f6---pezukukabopopizufi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a772969fbd7---vagisudujofasifavakege.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vufegikusopusisoduni.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608722eeca3ac---55213423659.pdfIn PDF document text
    • https://tepihtrava.rs//files/duxiravagudujakalunu.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/69309124533.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36671e5ee---68257085715.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/lalopuwiben.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607911496fa6a---dukijajaberobomilijes.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/wumofab.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/mesegexo.pdfIn PDF document text
    • http://kaies.cn/upfiles/210602175350383434isn4tz.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hns535a8nijem1isolhg6cdtla/kesixavinafafemaxisab.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/35954486539.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vuvofikusidigo.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/74524633807.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/fadokugatupezapijobujogoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ziyarat+aale+yasin+pdf+downloadPDF 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_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 15120 bytes
SHA-256: cfd3bd79eded8611ed120601a8695002912c16a3980f6efe6b55f5e50dea43df
font_02_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10652 bytes
SHA-256: 1fb21d203568385a26e1e3a0c6f870c10bc1649c27612b2fe47c42694ff9bacc

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