Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b20a6bfe4178c3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 04:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09cbe36921a4bf88ba51cb6c30eeae98 SHA-1: ef92f022bd9f5c4dc5146affa7279c7426ef97c4 SHA-256: 32b20a6bfe4178c3d951daeb17c4b04887c351e3510b7b491f28a64d6bf447e3
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing trojan. The document contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vstarmp.cn/upload/files/20210808_080712.pdf In PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/moramumafiwofapis.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7330b8f35c---zajawabajosa.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/pipap.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/woxokebotegit.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zikaziponanizarad.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c652354a3f---malijamilafunapalofosu.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nufavasizawenakilap.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d2669865912da3a97660045adaca06e5/vunowagoxuwumiruj.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/muruwa.pdfIn PDF document text
    • https://ebooksweb.net/files/file/fesifuwotuloxulukox.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/wutudosedomasubawi.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70afdd7deb---rilomipusetid.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/dafatum.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pusawosatemidonufisel.pdfIn PDF document text
    • http://riph.pl/userfiles/file/varikosufuk.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7cad5777---namaloredeboxosovu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaaffe110b---xurewovasemunekevo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9d188656---kenaxelujubavor.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3a1570f7---lutizazosup.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kegalakeligolewona.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/kadejupidozijex.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0b46e357c394f17c534e301ae3decf63/revixadivizov.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/75355058262.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c9fe3d7d---25792790886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=xml+schema+w3schools+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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 17244 bytes
SHA-256: 332cd7be17bb92fa1c399836fab23e7f8f93d8ee0f2519dd89ecb6c26fa4dc98
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 10756 bytes
SHA-256: 9bd0341ef0d2d42b0930df3be1f38d096f919f13c4d98620d5d28c8c1918a677