Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9117538389afdb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 06:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0dbf277b9c50eaa0b3a8ea9f8ebac2dd SHA-1: cf0c7d74779566637ff2f4bc0c4df7adc5866833 SHA-256: 3b9117538389afdb8d81f9af0bbd08168d159d5de349e318428e1a22548d49f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/395d4311b80a8317bbfa7c114091ae7e/23444458385.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899852b149b---paverubaxemosunagale.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/nidupoditenatimetu.pdfIn PDF document text
    • https://patc.fr/imagesfile/47830178702.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kesefafeli.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/75965632349.pdfIn PDF document text
    • http://psfund.org/public/uploads/files/cms_files/5714035198.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jovol597sj2r7hnrh3uji8urel/sekadixetobona.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/27639115528.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/14781808830.pdfIn PDF document text
    • http://klhl.com/userfiles/file/lijimadonuxofewanewap.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/18336142377.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/80717088125.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276089b09fd---69151745535.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/jazawogu.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/58946859849.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/pokaginaxilesavazajalolaz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/517a4b5ce19b590583540fe71c4d613d/xuvuboket.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/45477278527.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rbdnctqc6nuvg5t2820hatvl68/bagonise.pdfIn PDF document text
    • http://benly-carson.com/product/files/zoruzusawufelutex.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/12467903bfcb63cf9d07f59f9225014f/zopopamukunubefimudosuru.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/20890812684.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfeb110f4---37004053794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lettre+de+motivation+en+anglais+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_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 17804 bytes
SHA-256: 19c9ecec17242c67393b30d34ef3b29065da01ca807d380d9163b9dea193136b
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10864 bytes
SHA-256: 22eaba7cdf59daea528f407277ed615788e7694e60a727c738b79c2e4cc03d4c
font_02_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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