Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a12b3273717d85…

MALICIOUS

PDF

86.0 KB Created: 2021-08-15 05:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f7a7e39a88197f7cdf988f5d891e6c8f SHA-1: 01044e881407ce633e2bbfae46dd4ee8ae0d1b95 SHA-256: 59a12b3273717d851e963a9489b1eca76ec1823aa568212992e46d7f74be75c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://suarezbeltran.com/aym_images/files/62091672667.pdf In PDF document text
    • https://advantagelic.com/singhania/downloads/file/85935182019.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b101cc62e47---vivowusu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f4d0a8093---davofexeva.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8e54951ae---kemukapetumavopixok.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/76920626922.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16111d88b43a7a---zalupomakuzoxapejedimu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb3c09b39f---ruwozi.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/34054922260.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/17285246977.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d6pfkuqhas7kqpu6fme9hnshi8/7447002040.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45897a707---61496856707.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/00b0cdc35d7f8777c26801090373df71/zasefixiwasewo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/rifopikidekepeler.pdfIn PDF document text
    • https://slide-bearing.com/d/files/doxamesidudijemoj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c567114573d---98666054604.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/16493970926.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nj19q5sh0pi6jve1777isoopj1/12086095492.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/20487283409.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b6624cfd---vexudipagojotezoxumivuto.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/3343163235.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92d964ca4f---ligajamovafidagakozut.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/14987785714.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/dedemirabupovisitixolawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+ps1+emulator+for+iosPDF 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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 10896 bytes
SHA-256: e064eeedb54da588777c3706b9363309b6c68aecf19a33d0eeda943454b7cde6
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 17084 bytes
SHA-256: 76e2fe6b0bc29a0fae19f09b46b418121041145d4d7a9b44ccdafdc0be346701
font_02_sfnt_off0001311c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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