Malicious PDF — malware analysis report

Static analysis result for SHA-256 b586ebe296e068a8…

MALICIOUS

PDF

130.0 KB Created: 2021-07-15 21:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 95f9b1ed21e21e3874cb1458e43fd1d2 SHA-1: 9cbad6066d1e6561af4010b9b61e38ec12e6e3b5 SHA-256: b586ebe296e068a82efa2351f30756e3979c6cc777f709511ae802694528f3dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://gelblighting.com/userfiles/files/borobofopalov.pdf In PDF document text
    • http://modern-pro.ru/files/file/joweseretipodaritamononu.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/11172379873.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f66c696e6a541a057f6384447fab7a0/jumozepusixuf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a833499f0---29108711511.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/88057367993.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbb08b4bb---90339327566.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09ee9311c---47381008972.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c8935e8edd05012417607dfdc4dc4aec/woxixegizimufe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/56160979069.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/99467678056.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b99e5f647---13691290147.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/gunivatemebowep.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9447ed741---86373229343.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/58145451480.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9a6f59bb4ee2ea40d9734b17e6c84a78/38347379231.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/22267519698.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ad914aa7d093fc3aa58c3cfef46d319d/laxotadogas.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcdae9174e---kogilob.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/69b2fae6e510903734255e69df72eceb/zosakabudagatula.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8b6dae6b41bc8e3553ca01ad376de031/43540921315.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d83b16af74273a657e5de997c88511bf/53488203740.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/tivotenutivefotukerod.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/95b38822957d450b51a693f8d971045b/97661216255.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f1f50771bb08c889b33515b20328b8b7/jakajujabokupituratezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=struggle+for+existence+darwinPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000197cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001afe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFE2 11012 bytes
SHA-256: 4f2b535bb736f725512eb3481af1a283d20f59fd37a1c2fe369346d7bb7b2973
font_02_sfnt_off0001c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C97A 17944 bytes
SHA-256: 7d8b30643e57f32759a52693fe686ffa2188664e86bffa62abe51a4eb87ca6f9

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