Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2750f527f6da81e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 09:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f221a1ee0fb934e6f41e18c4d5a00636 SHA-1: 68e943c30092d763585074376f6e9d8365417dea SHA-256: c2750f527f6da81ed675f287ae7ca598788f5384e389edbc932c6c02a130307d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=zombie+gunship+apk+download PDF link annotation
    • http://cowmoo.org/ckfinder/userfiles/files/mabirikukolilobij.pdfIn PDF document text
    • https://scalping.ir/data/files/file/faxaz.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zenosawodezazowusak.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nufipinapegatorale.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5majb1kq9kuga0krvn5khr5dql/matiwixi.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/tadubutejuxoxi.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/tudopegux.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/64451303361.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/volakewagujiwo.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/59675028510.pdfIn PDF document text
    • http://okun.su/upload/file/jawufadozipisopafutaxawa.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/39946452805.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d12dd780---terokuv.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/vinekusij.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/napemodaxamedezavujivel.pdfIn PDF document text
    • http://taociren.com/upload/file/2109011757214495028gcwg04mhz9a.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f186047f04---kunosezabexi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/89833100588.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ea3d89417a9add7fff01678bec640115/9170057504.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/madowuw.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412374a03e2---nowegikiwukisutij.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39653475197.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138873481efd---34161364291.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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 18420 bytes
SHA-256: b97c925568724b38dd7ca2285e3ab97682621abd8e2c487b941dd328ceb99e6e
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 11020 bytes
SHA-256: d381d3aa7266d3133cabc29ddc7cf15c0f30623a213eac96de787f65f3e8980e
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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