Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8f918f441c81c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0207504195025bd9ffd49b735dcfc93f SHA-1: 71580b82856dd3338088952ef198278b0912a00e SHA-256: 82d8f918f441c81ca4d2f54b854f578f722a50bca61588675c156bfafb31e16a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely serving as a lure to download further payloads or phish credentials.

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://chcial.ru/uplcv?utm_term=cubase+10+le+manual PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082120b3ed66---nibufirubenovumipudeni.pdfIn PDF document text
    • https://asken.as/bilder/file/wonujukeb.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/811015f4d576fca88d5dcfb3ce22ff88/jivedolitidofiko.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/40862520892.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcdce1e37c---mekimuxizugagimodigav.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rbd4dha2d7mllrpq3q37ib7n6k/wavolexa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aa7305d67dd6a86a58e571b51538e4d4/95710985484.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/rerulefuk.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b22ni999h844rvskiup2n24v1/18253308053.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d9f5213d---xoloxikexukagaroso.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f783d4c978529fb5d8833cc07b0852c8/34375808867.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/11195142564.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/68500961806.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/sogevupuj.pdfIn PDF document text
    • http://berbun.com/user_img/file/zegebikokogob.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5045a4c00a9a9697885da07e1fb4216f/29203249931.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/xedamuxemikefofeviborut.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/27352683733.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3dc2319d---beziteperapafabilo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/mofudibenosatetab.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/jitazedab.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c922f60b---96198361622.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/nozokodajumasanixesuk.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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10304 bytes
SHA-256: e44fe427e65f4e56072e2001c38ea0855057c8ea1edc0061aefdbd6f30ad7b7b
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 19500 bytes
SHA-256: 5c1367bb9e26efab645dde2149406a08e02d8e7b555b5a55a375d9785451066f

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