Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c947ba47c5ac0c…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 00:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9394988be382052333a89e0f910ab5cd SHA-1: 7aca2967dad12434a9235c13cbfba1902e6f40ad SHA-256: 68c947ba47c5ac0c5b837db8fafd39615e112d79c22fd5d0f6f4faa0d2c90eb0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a link farm pointing to various PDF files hosted on compromised websites. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91e49d20dc19d1cd006ca535fc75523c/lipiberobegavinulur.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/zolunoxelowirefutaxaful.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/dowafewijoxomufas.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b96203418---88835716837.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/lamojimiluwe.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/85108719669.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/fubikusigikasakosug.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dde7d05d9d9bc4f76dfd28525e5c50e3/gukunelodisigakifugadeju.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/44055034669.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/nesizemevizewerakezezaz.pdfIn PDF document text
    • http://wdnederland.nl/file/25036636076.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/8177065660.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lisirido.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/56cbb1cc2c51474895382ba3fc5b17b1/pazuxunaxixudonavujo.pdfIn PDF document text
    • https://empresa-venta.hr/files/66508236592.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/31930303302.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/33110110896.pdfIn PDF document text
    • https://noventa.cz/media/files/file/89633544611.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/24800050455.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/rimujokonesizow.pdfIn PDF document text
    • https://gilbertems.com/videos/file/10487758784.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702055456_ofofle.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/52290448433.pdfIn PDF document text
    • https://corghialberti.it/file/98527469900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+to+docx+in+javaPDF 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_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 17832 bytes
SHA-256: 0ef72eae246b51faca821afaa2843f922c18d2ac6fdccb95775710b90f9e7591
font_02_sfnt_off00013e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 16912 bytes
SHA-256: 4c2e2dd89571b5c6667bca3db4add53191c885bce8bb76009609b591012038f1

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