Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cb80eb72d2aaf6…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 11:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0f39d37bf07a684eb1070f6bf896936 SHA-1: 2f7e3d3f1b9b8ce48e6a37cc1a3eaad83faf9582 SHA-256: 79cb80eb72d2aaf63617ad2732c06dbf6aec8ba3320bef9fe9367c81ed4d8a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161460f7fcbc0c---30839454247.pdf In PDF document text
    • http://bwlpsalisbury.com/uploads/files/49785184998.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/54838485135.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/batijukarugudubizu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614149c7a9a6c---77977652794.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/77525318213.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/tanolisarogokonemeribi.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/wesud.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/12763485872.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613435fa53009---limowolubozabumaxosetu.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/83758206031.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/84686095872.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/depewedemod.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/dozunisewe.pdfIn PDF document text
    • http://elitacasa.it/images/file/54714896356.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/71301337742.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/boxarokibazexujinoxifet.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142ead3c558b---jodegazebeso.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/91111566038.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/juxubaperevamapolenoxuke.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/tejirimu.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/tafig.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/fesapagedovugujadadu.pdfIn PDF document text
    • http://186086.com/upload/files/fodugavemirifetim.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/xafarozagovusubulatudower.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=windows+7+pro+iso+oemPDF 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_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 17772 bytes
SHA-256: 005cb760dcd260363aadf00684b66a301bb77865fbe35e94b6d0b74bf2b98916
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10376 bytes
SHA-256: 1e62c07863c64502406935c4612f5f5b874b256d23b87b9dafa6f4f9ed2718ef
font_02_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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