Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57b5641da7ff8e1…

MALICIOUS

PDF

97.0 KB Created: 2021-07-23 09:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c91366f07e8300f371ef4d9d60a46469 SHA-1: f6491b2840a17bbea963535618e5d8d06dcb241b SHA-256: d57b5641da7ff8e1a66bc462aa2e2f8d349f4e8984fbbc5072cdc3ee55b26174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/suq184gfaq5eevrnn0a6lcpbuk/64549138266.pdf In PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/59145322906.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe91a89711---bedobosaruxesi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd0d20f12---14250758742.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f5f272e3b325f000f11425846fd1bd38/98248620356.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f28e1d11dc404e0925f4eba73d9ab064/juzulakaguragununinowuzo.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/33224866712.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160778a8b8acb9---7822769506.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c043c0b64ef4749ecdaba36659f2f936/70874074626.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16086054723af6---bogetazut.pdfIn PDF document text
    • http://360mart.net/uploads/files/wumedijojuloz.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/zozazizusesinafakazi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/174c4610c759adb7a2bdd97056c21491/kizogobora.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/aiat925icfvr4fb8jbb0slbsg8/mewibuze.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c9e1b1965153397543fefeab44f520f7/vipunenejen.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xomosuro.pdfIn PDF document text
    • http://pronobile.de/catalog/file/69275246353.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb93d13d5---rojudan.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fomajixobozabixew.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e17d1a56---telemisesebijuzoweten.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3506bd25d---sizidewoguwawej.pdfIn PDF document text
    • http://packturf.fr/files/rewaxegu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gezenururoludij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=down+by+the+bay+of+the+hanky+panky+lyricsPDF 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_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 19920 bytes
SHA-256: 17785b21dbe1510c14caa556a81d521d7143b153dbe0edf9f8581559f0cf4997
font_02_sfnt_off00015caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAF 11012 bytes
SHA-256: c206b79e6694990ef3df1eae8858b2cec0f027e2fbc2f2268301e02cd9ca307e

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