Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8527a79a60ebf0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 08:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c527150a23a58a10e97b19361d38521 SHA-1: f2ffe67b2ef6e870857ea0dd4e559558f720622b SHA-256: 7d8527a79a60ebf0e1444c707d228cfb732f19e417270d5d77de8cd2cc3d6e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to manipulate search engine rankings or distribute further malicious content, likely phishing lures or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/3c4765f541a68c3a9eb7cbb568220654/94163145589.pdf In PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/42954901779.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xijogapologadorukedaraf.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abb82659a73---gejir.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23904875644.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xezofiwufojiri.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/71f5bdb08e6e36470a7d7cd8f06ee5b1/77234050697.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/88307456024.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4a549676b---rajibibulivija.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/97335012807.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/33651309832.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b4dcbcdfaba08cd78f507e7d70dfda04/gufotiti.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/42314744626.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/tidujuzi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3ced7d53---37711403724.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/bedaba.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/51697072084.pdfIn PDF document text
    • http://lucann.com/Upload/file/60671476677.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/77655281575.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/8215278875.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/17867786441.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/kixizikonudinemevufexelo.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/febujuw.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/movesifiwunosivimab.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/foxuvan.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/72bed6104364b7fa683e60fa0453ffc4/risoroxomidubatetizebax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kinds+of+adjectives+worksheets+for+grade+5+with+answers+pdfPDF 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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 17648 bytes
SHA-256: 6e73aff5452fceb09072122821bf6855fe8262ddc7edfdb26d768fecfeb40387
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 11352 bytes
SHA-256: 7d99a188606b513f7d2a0f0586dc21c298f3aab310230ed5050e4abcecd16af7

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