Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb613abdd1a7f0f3…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 03:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3da1de2f229b106af653e493c8a2c82 SHA-1: 163e8c39ed99d57f334ca0dfa950228f6abfe21e SHA-256: cb613abdd1a7f0f3e89324c1aa2ba530d03a4470afeaf5ee4a3742bc704c9ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/540tt076kapdiddlae37074pj2/terenibavoru.pdf In PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/19114560334.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee296a1bd---xaguno.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/81549216568.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/15060763876.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/77877551697.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/pavasabaref.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0777b7eba---1924925070.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb02786e7---vomevawifodowakivizifa.pdfIn PDF document text
    • http://cocoal.com/uploads/file/wuwugo.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/77471362519.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9f5066f02f31783c6872cd42679ad843/67452963427.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b2878dc0a8debc67423aff127d91b000/wijuk.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/murisuj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712ad39d01d---sotojiruramogazuwafelig.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/kokejivoji.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/vigun.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/62186116554.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/xusegu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/37613426333.pdfIn PDF document text
    • https://werbemittelag.chupload/file/59970863773.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16103929c66362---98745451182.pdfIn PDF document text
    • https://digireg.cz/upload/nojazurazenowunepoxajo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e776d1c4e---80158558524.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/1522815724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=retail+management+pdf+anna+universityPDF 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_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 11044 bytes
SHA-256: 31b294885601203df0058d1c31637e6b04dac44b8bf2923190fe0facfcaa0734
font_01_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 17320 bytes
SHA-256: 8ad51ccce86840b7945e65cb5c2b1b9e7ec82aa18a1dc7382d0f34f6cf5a44b1
font_02_sfnt_off000143a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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