Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f67d48ab6a89cf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 10:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d8ccfcdbdb219bab5cf06e7dfb5d73c SHA-1: c67414339e23c763ca8ea15020ce721f97b81f7b SHA-256: 68f67d48ab6a89cfe9abc116f681a25db769a26aba0119d70e0eead23f0c932e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=cara+block+notifikasi+iklan+di+chrome PDF link annotation
    • http://enotecagaribaldi.it/userfiles/files/dekotapewofewiwigakifuful.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/87890978880.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xupuxevovige.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/66081549622.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/93755140119.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/696a131aa91834fda4705f273d456773/82938731505.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/49901951603.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/6904473491.pdfIn PDF document text
    • https://regenerateacademy.com/file/vigokeraxufefedazisowaban.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/13059631750.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0afovbrqa1n9ts3b2qd75kjr59/81225162779.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/rifetisinofiwife.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210919_DEA412871F01CB43.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3kdto4f0v67n6p44rkhtg7fqoq/ropepufoginodavarukizono.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/55547330769.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/duridimosejeroboj.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/pegejinenifolegoxerer.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/79301422828.pdfIn PDF document text
    • http://calisnt.com/uploads/files/buwixemadegipakemir.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/6g4mm45fhlhnmgaecgj7datt40/tivulaxisikapupidulupelaw.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/98204761183.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/32523549303.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/30593550866.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c9341656c4d0871f64c0a19a0d656a18/44935760803.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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 11004 bytes
SHA-256: d5575859c700834bc3902ef57bacbca8816b415966e329a9b344500052f7f908
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16916 bytes
SHA-256: 3e3cb331d8483107a750723bd3bf46851f9578623a654f06c276bc908303dc0c
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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