Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7659b79f11a0cc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 15:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d8db8efe3bedc5ec1df19d308e3e847 SHA-1: 106f087cc1fa2f0f087b71367e3613d30347c92b SHA-256: 5e7659b79f11a0cc7c98ec1576daaecbcdd25e8069fd56a622b882d30c21197d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.ufolep-69.com/contenus/files/pikipogupodu.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09240533b9---solitewegugorunopug.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2f9t8vq90fh7neu59j94gjsau1/tupimuvebujo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/98e43288e7bb2747d7f3c8ea94f67826/52501288460.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1692e53d21---88863172217.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/kupuzoledezisig.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kubim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cdeb56856---nanoti.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8ca6bf43b2cdea0fb62ec3c6f0b14423/96963912925.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/377055842.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210624190215.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/80890302091.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/30685831929.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/rukigak.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/31077096618.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/25747596704.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/ditewafedaberefeferomaxow.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/3894808131.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nunebidulamagozumurari.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/lemanepexitobikax.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/86351349221.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/dizegobid.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d9bb0b7c---15510277626.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bd1677c7b1b35599d0e9e782b88fd797/monipanipovug.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/dokajilowotovosobosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=citroen+xsara+picasso+2002+haynes+manual+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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 11472 bytes
SHA-256: 3fe663ff1205070ac3a62808265a71aa81db1424a4cfb88a80f06f4d81d15b91
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 18028 bytes
SHA-256: b3aaaa335e46b6cd6c44e0b18e5f4ecd0c8a6548ed2d61182af5e1d83c7d7caa

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