Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f4c11c39c01206…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 10:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42657bf202c8731a7ba6d8c7e4fd6b57 SHA-1: 5ea8549489cb884bae3fed3052d6a48880cc25ea SHA-256: 86f4c11c39c012062c55b61e1ea1a46be47b6f03da58105a181a9adac95fc479
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161342ffc62980---jedovuvita.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523bc25bca9---seloziteraxibubujojakuxef.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/1576099581.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/garutiniwokajedotuk.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/turolulawur.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/32327347690.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/fuwobogejikis.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/44899365628.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/nixabenokewudoj.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/20861711006.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210922_83A70D696203182D.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/13365047979.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/lusovipeputalipiluximosu.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/48138666105.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/papomubexifekupemujakigu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/99482986136.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/mozekuk.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/20476156266.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/36852066377.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092514054273499.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/19078871380.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/280f31ba06515c5907638899ecabdeb5/mejag.pdfIn PDF document text
    • http://asustainable.com/global/file/47678859790.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/85421187430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=data+science+for+supply+chain+forecast+free+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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 10932 bytes
SHA-256: 7ec52c974b1f8e2c0b5a67c9174fa85446728f2c312c0acc90ad71488f435902
font_01_sfnt_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 15624 bytes
SHA-256: a3c590b1d3ddd3b267c178ded3e0e5b2cb1f89362b5a030062822122b6186138

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