Malicious PDF — malware analysis report

Static analysis result for SHA-256 265b2444d10a7c5a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-06 07:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7a72a52e98dfa4ab6953c77cc24f4d6 SHA-1: b56949d7920ef4892f567c02ea9e2c50ec7654c6 SHA-256: 265b2444d10a7c5ab089ed74b133b9cf0b6a5df9b2c600879694f8c2250e9e9e
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or appear to be part of link farms. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://archism.ru/uplcv?utm_term=traffic+rider+hack+apk+apkpure PDF link annotation
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bak8vdmmhplnam0p2vb6q52e04/71834941962.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/98336628437.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/24e874be48b60d9d54d557461d679f1d/19306349954.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/viruw.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/jarobipazibevofebedem.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd51317c75---mogarezorogu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/45577805793.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fatirudak.pdfIn PDF document text
    • http://eko-uklid.com/files/file/42789720760.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072582927049---ripodetiri.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fe7e8d4455fd31bcc143769a76a89ffa/ferarejes.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c05ac09770636a463228093ae381a75f/fenozirusepigumimipox.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/porakidozoxo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/13830537780.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e357d4a095---vinatataribijojejuja.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/girazevofifekix.pdfIn PDF document text
    • https://preciseenergygroup.com/media/78798572915.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/zinuvawubigixisojejexamop.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c714cb107e9dc4c0ed4d4f683aeadfb7/22711474104.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/dozopex.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca7a4570b---nebuluwirudopofijebezew.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/acdbdb74fae4eda3017965767d28fb3d/16561157169.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7df14eb0e0---7419959165.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_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 17360 bytes
SHA-256: 0aa6edb2e529c5bd2555615b8b5ac81443e7247dde0216ef9768bfd77b1f0181
font_01_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 10336 bytes
SHA-256: a197cc77978c8df17a86c3b82cd6c5cbb994e28375c5450121589bd281daa62b

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