Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1595c3947ae271…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 09:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97d72d121eeb595f59cf87f72280cf7a SHA-1: 6531ee82cc146b7ae23418620d2a125c9e7e620c SHA-256: 7a1595c3947ae27134c93ccb162a88362ec77fb51bcbb05d19bd69ba673e60da
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload directories. These links are likely intended to lure users into downloading malicious files or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b00ce850c---sevalijitezunelirazi.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5d3a361b---lovakitotokovivukeno.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9a39a70c---xojujumapazumiropemazo.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/57714292898.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/44734562174.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/notimewaduroge.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rikoko.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/70036642921.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/25800102768.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/23710903152.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/69063410114.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e61cbc8cbcf6214e787e7c0f0f582d27/bawatomabowezavunonotaz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f8bfa00dfc968494b118fe830daaddf7/wexurubojeb.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/18781700636.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/nadexepajufusupilakawepal.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/tirekisanazolitogog.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/63204669719.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/97310089913.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4853ad6f---torenopobo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2b68b91b604c7b3620a16f1e744d3af/24946091182.pdfIn PDF document text
    • https://csodamalom.hu/files/files/18153671099.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/sekamedejezeb.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/52880421127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bbg+beginner+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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 17836 bytes
SHA-256: f42ad8f3f89cd3589ef286614b60227258faea1445d62455b4c12c07d32eaf29
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 10272 bytes
SHA-256: 7dcb1e3a08580e5ad7e9c657a51fd3b4af593812907a4800d60bf8e66edd0508

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