Malicious PDF — malware analysis report

Static analysis result for SHA-256 535401cd3558e613…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 12:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 941a5d562a6f45674dce252ff89f7d20 SHA-1: c0d9e5df0bf28270808a75a15ab20595799fee6e SHA-256: 535401cd3558e6135882772bb8be95613f60af5ffd26e7421be4616df5a0de19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The file's purpose is likely to facilitate phishing attacks or distribute further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=leftover+christmas+dinner+bubble+and+squeak PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748591ff60---66580692904.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035ce5639d---21947025762.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/rixogepibisunolepopar.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216241859312174.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7942590aef---lazupitabu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6e645d49cc9e25b0be75d2cf645aea0e/55886575588.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/metigivamu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/varugeriwuwuwobuwolukise.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210610_AF4219B8414C8F37.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ca0c698d9---zefubapegizewikidaful.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vfr7pa3lbibqgetk72vaqoc8pa/20118919235.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9ed01986---tosipajo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/af76d094a7327cdabac92c28709b3a91/24231746740.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nevuzetuf.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-28/20210628025343357429.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcf55536d---jiruritijib.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5193e2f9d2---94359319827.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/6urohmcntf2dr7lgo23behge10/witaxotaliderurosenetufa.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/rapojamuk.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0d6ig049quvipjtrg9cdotebni/74675851720.pdfIn PDF document text
    • https://777mto.com/contents//files/82009458706.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9df580c2---xuramuwesal.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/gixobagulose.pdfIn PDF document text
    • http://stasta.com/userfiles/file/kijesudofikaru.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f89c09a2ac1c4ab6527b3663a525d76d/gexakepibezug.pdfIn PDF document text
    • https://computerzone.pk/file/41763651356.pdfIn PDF document text
    • 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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 17500 bytes
SHA-256: 36ac37f0d56ebcf271d46a2df45dce6634d680b391a098a99eeb8128698e2cbe
font_01_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 11244 bytes
SHA-256: 9c70be4721d9a7b04e296dd84b0b99312815e729edd4c88d9a56dfe9cca5b860

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