Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a6c82f32d4ef50…

MALICIOUS

PDF

105.7 KB Created: 2021-07-23 19:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 548b443255a8b4aa3003f21398611127 SHA-1: 30d1898b29da44e48ca1ca1d858b6104eafde8de SHA-256: 83a6c82f32d4ef5084c01c8259e563017f62ae61bcbee27ccf937e1ee3cd0dee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm suggest a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb96415aaca---25332390919.pdf In PDF document text
    • http://santeh.md/img/files/bixinijanalinidi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a451aadb6---kuliwusotudek.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/68815250390.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/79339699707.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/90757fba96400939b30387ce4f4c34b2/79366876098.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4129799913---14779927602.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2754772a---lasanezabemon.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/sekidizapugapozogesaturex.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/detesolepeporetalaliriris.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/43c3d396f17d11377827b293e35885e2/89803782120.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/91278114298.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7edb4cc6fbf28613d0134081af0c345f/ranadadotin.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/76161475576.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609954fb31d7e---vosozukobilovun.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/76652379561.pdfIn PDF document text
    • https://brs.jo/userfiles/files/94862468811.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/46031405847.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/14357743318.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/sivowezurixixalejuwiruzu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a878b784a---20588214442.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c35e7ab4---dijimikuji.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/pegawini.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/55f5658c798a82a64119ee69a13349e3/46310155287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=story+writing+ideas+for+grade+6PDF 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_off00013971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 10924 bytes
SHA-256: 863156a998ebbc145fa5dd4529e12c14a49f691adea1611cb4d463c78cf1a6ae
font_01_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD7 17452 bytes
SHA-256: 8230e9c38ffdc67f2ed76d0fe9f21b76a9b6ffc8b5e8565d5a54179f9f36dc9e

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