Malicious PDF — malware analysis report

Static analysis result for SHA-256 8884b424c01df13f…

MALICIOUS

PDF

79.2 KB Created: 2021-06-27 14:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7ed28fad6d7b6379477d8af2801bd5b SHA-1: 5c0254758943292c6abff51269a5b7f8e79cbff1 SHA-256: 8884b424c01df13f034428343c7beb106fd50cbea386f4dde088e16423ca3929
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://ketchas.ru/uplcv?utm_term=mutilate+a+doll+mobile
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0f0dfc463f99b4eac0043b7b6acc2592/78740638239.pdf
    • http://whkmradio.com/userfiles/file/80331151452.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c759231348---39320509251.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/pu4tiigs0gso39qr5colpej80d/jagosebowezosawekabagexa.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608726bfc88b2---20716577291.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb45dbbad---3274492433.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4e388a007d173c1d17c88f8ef0302bfd/7680516455.pdf
    • http://paillasse.hu/userfiles/file/kunurofow.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/a5823a0ec9f29622acbb135bd8537bcc/fusevelipuxelerenovefurap.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2d1e1222---pulonivuketamusuwe.pdf
    • http://vitanova-cattery.com/upload/file/julagaxafumazavimukotogi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4724dab30---bawixot.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/76f1d329062a0d62d329ac90a64d82b6/raverudene.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8b92246b---tetazobod.pdf
    • http://lezeckastenakosice.sk/upload/files/44837680414.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bebb830b0b---76983709519.pdf
    • https://aartipalette.com/userfiles/file/47870676621.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6me42nr6dj7jd7svdrs86aelia/17289570148.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf37640344b---gujepopevagefux.pdf
    • http://ventilatoryzlin.cz/images/file/93429143274.pdf
    • http://kppzp.pl/userfiles/file/30028511752.pdf
    • http://brnc85.com/clients/878796/File/jakegimajafatu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q9dqhb48qva9artqgjh42c9nf7/wibezep.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/tejehddnkjjcj6o1itdru1e06d/5779638264.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5637445f---runivimulibezerejifemu.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc216ec328---piwawipegowi.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3qh7udiq86t7v3tfski9ma47fh/36791451996.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae6a920a0---64555045452.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 16792 bytes
font_01_sfnt_off0000edd5.bin
8aea07c00670f1b3e845d680561dcd73ca78c333e87743583e9b00782fd129bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10268 bytes
font_02_sfnt_off000104e2.bin
0dafa5db64934f7891db34179f932b21c23be30169b2f2aeeea36b44f8619c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16448 bytes

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