Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c9243d89266de…

MALICIOUS

PDF

188.9 KB Created: 2021-07-07 14:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b1580e24413329878de72c76c75fba89 SHA-1: 743f552c67a29b61954c27a1ecb46680ee3a8d4d SHA-256: da2c9243d89266de0b3ab371faab0f06c530f48dc6995fc1b520af2ef0be0063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and potentially disposable hosting. The presence of these links suggests the document is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=titled+and+entitled PDF link annotation
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/43baed20cb9e86fb6f64fbb87643849b/93187462116.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/93573319914.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f61a50da---16900934129.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/vifadosewe.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/firorisuxanefapukubured.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5b3ad8e7eb50a83e1da4ceb47dc8eaac/58304558610.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/wefevoraz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/2rvu6f0emknhv4co6vnoo4h7ul/84391143445.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b14b7e8e---samoravijet.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1fccceca3---15940049594.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb02ca70e---runebitipekokasige.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950d010e364---jefuk.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e4388868---35514609622.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vutanulejifugokevavuton.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/nodan.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/64609003262.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dofutezugisilozexezesu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/51671434590.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d867211c---16459125658.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075781df1311---93988577816.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/51644280818.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_off0002885a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2885A 9816 bytes
SHA-256: 398a7dd21979e4596a82d44ae9242b4e5fcb316d00d1a805f5d112e44fe9254a
font_01_sfnt_off00029def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B601 18360 bytes
SHA-256: 421ec2e58a2d00f4daf5185e0467d87cf04b016cb4959ac957491530bda00d18

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