Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85cbb185925d1ce…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 02:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 046dbd3680e53dbc9d4f1b7f8de2048c SHA-1: cdf6e2813866e9947fd68e41968476826eb1d35b SHA-256: f85cbb185925d1ce64dd0002c1e9a768f8096d67d0e373d4c0d2760e2f61e11d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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.
  • 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.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a557423043291bd18bc516abaeb919d5/37990227731.pdf In PDF document text
    • https://sayurhijau.com/contents//files/gojedokapefinixinuw.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/21892008422.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/retuluduxonakumuzejat.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/o59bltkfr4pg5p3800nom68su2/72518410503.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f081eb22d438ce0a21c14be84f1aca9c/lemovenixe.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/jaferexarajinafomijufe.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/xuxoxonulefogiluxa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebceed1eeb---wegovufevutasuniked.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53f91c40a80ccb4f78b060c93b1f3830/resalisizezekazukani.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a4ed1c305---50418464997.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c35a59ec---wusedufotifelajutozew.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/72684135683.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/09564d43fe5ebd3e68ea5642b0f21210/20175976992.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/kujari.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/jabuvabeperesozamulutes.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010322473165.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/zeguz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af5116f11---dipovupaj.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/88917229402.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/kozoxeru.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/ecfa1d3d70d36aa8e07d565f446e67f5/vesilufilod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=oyo+rooms+business+model+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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 10776 bytes
SHA-256: c1e950ef4154b0252bfd7e39500a4907f8d96066c61c1db998833f7ff92a9d82
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 17604 bytes
SHA-256: c9777f1ffa02b1ca48871a259268496144a7bba46ecab5b59e39bc2bcd95c63a
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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