Malicious PDF — malware analysis report

Static analysis result for SHA-256 f150bd38ac34942e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-29 12:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd920974cb9b13c6d1809c4a448db07d SHA-1: 0da2ea18f2c22382a39e338ad353537343bc69ac SHA-256: f150bd38ac34942ed52bdedf8ce9c6ad2019d141660656e3fc8d89309d567866
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=verb+to+be+exercises+for+beginners+pdf PDF link annotation
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosuxomujexo.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/7673343054.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f505639e56---xinuxebasufuwexam.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/35048551559.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/90452388356.pdfIn PDF document text
    • https://recrut.com/files/files/xexisewutokexeso.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5cab4e7a---rebuxarun.pdfIn PDF document text
    • https://gcs.kz/data/content/file/7066056734.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/fekufuza.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/18128174672.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/kijujonaxipofugu.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_053606.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/neralaxopovawefikebisuga.pdfIn PDF document text
    • http://labradory.pl/file/84857415240.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/kojikobadi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614e64b853b06---vosoxatipepiseva.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/gesikimos.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f4c43f99fd12beb7fd4dc22c5d539716/43296405286.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/memezolo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/katogamujesavixifojujum.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/gewimosejopirewokaduvon.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210924011450.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/73748324913.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_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 19732 bytes
SHA-256: dcf04a1f94385c1827c69f8b3f4640e7fd073d456293080a8eb70282247177f6
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10796 bytes
SHA-256: b0808a1ed49678f1d16065e95eb01c1eb781b7c36f6e34a812e4d1c803ac0b8a
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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