Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26a22b8c470e695…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc0eab89a70677b409d756e93b39e43b SHA-1: bc5120aae4de21d5434db20591590a278b8f60f1 SHA-256: c26a22b8c470e6957782baa54b7d725111d9b4350b65f37ee8e59fdbc749e39a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users through a document that ultimately leads them to external, untrusted web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=campbell+biology+for+neet+pdf PDF link annotation
    • http://eot.mn/uploads/userfiles/files/xibezosojimif.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vuderaxixuwinoz.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/winezanumubox.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/sikikuxawusete.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/40670211135.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/mofugiluranifo.pdfIn PDF document text
    • http://saint-party.com/media/file/62669863326.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/tanatatulasibivaso.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bl05g9lshfa5nm7e4rdlvqqcgn/94751897519.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/89102540306.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/50614566072.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/vovatetexiradofa.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/nigubavuzopib.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/66472231816.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/rurifaxetotige.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/89848921722.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/82892421269.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161397164c3787---20013467294.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/38432567727.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/kakuzomekejebunixugup.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/62377884525.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/nasezegixow.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613413635ff14---11718576451.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/65722923936.pdfIn PDF document text
    • 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_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 10960 bytes
SHA-256: 75ebface5815db00e69db4b59499019ead3c073c6ea40fbbe6c782732906ae53
font_01_sfnt_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 17356 bytes
SHA-256: 38a6b78307bd19ebaaaec5a2f80b538ed283a8f44d82cceaecbb08a545997798
font_02_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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