Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabf64e3695c322b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-22 12:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b8fe4a871855fb90e5a38a5eff2e03f SHA-1: 6c0905776be47fcef787a8197482b9e2dca1c446 SHA-256: cabf64e3695c322bbc15bf970ba746e817a72506d3f1453a32de9b1471e837f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stalbeckers.nl/userfiles/image/file/posezulifevodokimozeteg.pdf In PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/risumebafaxitibebutetufoj.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/34883755957.pdfIn PDF document text
    • https://architektor.ru/uploads/file/62572301492.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/21477866338.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109112121115694.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/3743567687.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/potidaxamedigusuze.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/nabaxefura.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/77120143519.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7fc804tgh1hrb9g2i8tl3rkpsp/44969396449.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zurikapikotabepuwimaxi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b87942e5.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/lutonanamu.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/17224882555.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009e5842b4---seridefuwirinomologolufu.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/37133986578.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/joxemujarojumeji.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260b748e09---sugijeminopefetebasuk.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/75415208309.pdfIn PDF document text
    • http://szwygs.com/upload/98282329087.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/joges.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/daxaxixigap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fast+and+furious+7+full+movie+online+free+123moviesPDF 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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 18420 bytes
SHA-256: 033fada0eb01e9c372748433e0a5e2965cdf5df9fc8a4e5f632504611638a2af
font_01_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 11052 bytes
SHA-256: 50b706b99b71f755e678cd692b70a052b0682217ed292e7ee5fa5c88b5c13461

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