Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a6e4c18f5fa287…

MALICIOUS

PDF

143.6 KB Created: 2021-07-01 19:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fd23ef82cf9ee4eb50f0f77574e2da7 SHA-1: 716743c28121010ee0c89d81a5433cb35ddc787f SHA-256: 85a6e4c18f5fa28701511a959000f66684e6548f6bc3e69afba4fb3a72ef8991
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites using the Formcraft plugin for file uploads. This suggests a phishing or malicious redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://aranykoronakft.hu/userfiles/file/xaxolejudinusobusoli.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5698b1d59---64033990327.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d418d2fa4f---50351293176.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06505e2d5---5118481069.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752aff4cc46---87904541472.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nomoribivudirejuminug.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d1844f33---vukamewo.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/sizetuvegurodifomurepuwan.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/9429187815.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0a39feea918e88a1ec7304e9482ad94f/49469003009.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/nugujek.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1656a339ef1ca114863e28c587c772c6/ropabon.pdfIn PDF document text
    • http://yejida.com/userfiles/file/23203055480.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/41809680304.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmuopl6s4eqcmlnh14hp4108t3/41239274479.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b222b447d2d---82414179937.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/76ffbfc5836a7cd0713610e50377be1b/33411582947.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/busoxoru.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/nukusujugoxisulubalotiron.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/sunajexipot.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mtdbnq8gulth19t3truf4bio68/32611591887.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527163357.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3b771edb4a28c716927b9001beec8cce/tesatapiwevemogenexesox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=quantum+theory+and+the+atomPDF 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_off0001d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D322 10480 bytes
SHA-256: 32e2627b0d6e8f3a6c26fb8d1c302333c5d0bc21a5688bd92c24c3505d9d87d2
font_01_sfnt_off0001ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000202eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202EB 17536 bytes
SHA-256: 6ebfb1f02aeeb73662b424db8551acd20e08a74933bf41de3051c46b27e90373

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