Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f969db6fad6f13a…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 17:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fee81301ad4435b7583de5d53973a53c SHA-1: 559d2b500ac719547329face6a813ab6c9c3e370 SHA-256: 3f969db6fad6f13a872928960e027f61fad8864502d732d36dd4edab5f1ee787
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce89ee78f0---najane.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b202ea277a2---10078003225.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/suzanizuzozadizokive.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9b9c1108a2c78a4263a91241c5821633/85215232470.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c03017688f899e83dae082cf0de87cad/41232751718.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fsspfqu4td3hb08jokr3ml9tv1/rimezinuzamemitejowemopab.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096032b44fe6---34817003892.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/xilomadonekajufiva.pdfIn PDF document text
    • http://consade.com/userfiles/file/86327429304.pdfIn PDF document text
    • https://yodobashi-church.com/putefuxufenitine.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4c3f790b36f150a12d06cab4b436053d/71973150033.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/tilinigigedugera.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/5449508567.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d465d111177---wujegajaduvive.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/99756227903.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b786eef8be---puwaxosokomeloxekafatu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/2545663760.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/6219096137.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/85591133098.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5aa09d825---14524593795.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b50bbf3fda1---30910215191.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/eb349d177c1c5db8077bd5f5412a0843/44205954090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+de+mitsubishi+lancer+2007PDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/70499255726.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_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 19792 bytes
SHA-256: 62d463d110760595bdc4827bbc86b75aa0c21cf17be9cf80d924db731b4652e6
font_01_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 11040 bytes
SHA-256: eae3b9f418218baf05e4af5d6231fefe324425369f8f5e0ee928baf17d723624
font_02_sfnt_off0001473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1