Malicious PDF — malware analysis report

Static analysis result for SHA-256 e693436d99f36499…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 15:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8bd0532270036932bf1432dbbc7d38db SHA-1: 79fb3f0d9d1dfb8a00b11cdd1f0d169c421d39fb SHA-256: e693436d99f3649996ba43e0baba7e15ffae6f51e3f77824cb028083fae39807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pure-chiral.com/upload/files/jokoroxelaxexa.pdf In PDF document text
    • http://omni-links-europe.com/images/blog/file/fonerara.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403c29bf7e0---vefomip.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/1999452224.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/67339662346.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/tizule.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfeae8894---ziberedebin.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/66843547697.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/lumoxipi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366019f3e0c---vawurinefopirufowiz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850042f1d3---22357053972.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rfsppilhpg7ln63iu8qcc72pci/jidapazo.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/5447542677.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/rakumima.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/muvafisejevidemenokijipi.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/90487007112.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afff6ecf83---37903973066.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/36125639991.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/tupoxikexudirowulefo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/21021289913.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/didojiseluvov.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2e4f64614b346360d075a1ded48bd9f8/26395257157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=zoo+tycoon+iosPDF 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_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 9860 bytes
SHA-256: b9d246218a67573e514bbebc2a683c0a94bdebb60e20e07f17c9fb8a2fc3e1e6
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 19724 bytes
SHA-256: 5655b759f004276cf9b5f44f77a81de732626f4e4bcc40148549fc7586533b16
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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