Malicious PDF — malware analysis report

Static analysis result for SHA-256 afafa92c95be542d…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 09:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 902b47396cb8309f4af7436c925480c3 SHA-1: 88d6fefa76e2ad7dc86f5ba5a768cc6cd0b1c665 SHA-256: afafa92c95be542d43008ca90c44ab6cdff1c1970cf0d7e42d7325d84f75433b
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple links to external PDFs, some hosted on compromised WordPress sites. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is designed to trick the user into downloading a password-protected payload, likely to evade security scanning. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rabotatver.ru/userfiles/admin/subatujobamipuka.pdf In PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wunabagekabebebegidopapo.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/66804321796.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70274e6f0---69680061203.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/sujawisibijatavepurosobo.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/65352972894.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabdec13fc---15366333956.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/91502071353.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8b1a2830ccd443a076ad530c8f958d7/2845486770.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135955f4aa3d---zegakikedesonimap.pdfIn PDF document text
    • https://egca.fr/userfiles/file/lojewimexinewitepijeled.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/kezadozemogewatasipuvi.pdfIn PDF document text
    • http://7profi.net/userfiles/file/figis.pdfIn PDF document text
    • http://budropol.de/Upload/file/72157842825.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tifujarekododuf.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/bokugazinuwuvekela.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bvmrg5u30h07kfv30ueddlm9q3/zewikomunupijirujuja.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/vapodovezugatetadesope.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xerafetiwofewinatow.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/vusafaf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322d3863161---39855846113.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/86534065114.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_747C637D684A9439.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zitirimezupineli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+overview+button+not+workingPDF 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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 18028 bytes
SHA-256: 3b1a427252c40e9228bd9ee9773700743d3bcb73a2525f8cfa0b8f6481b64c46
font_01_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 10512 bytes
SHA-256: dada00455928921fa41ade240a6947cdba4918cb058caaf0bc6177f49ffb8af8

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