Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb46d491ceefeae7…

MALICIOUS

PDF

85.5 KB Created: 2021-08-03 04:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc52a6d43ea1039ffc821e3d22a20784 SHA-1: 57ad9224bcdf31fd6139d122700139f0ba6ccc74 SHA-256: bb46d491ceefeae79e9eca0d25870b13988a14b35670f2663969b1cef1c63b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attack pattern involving redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=how+to+write+a+newspaper+report+ks2 PDF link annotation
    • http://irina-beha.com/ckfinder/userfiles/files/35217207456.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7aaa3f99---71158007655.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/17118037271.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/dikoxuze.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ukgbov30uj8j2n3dp3n3cb9nmr/bemozijixivunimisi.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/sitaxixerozubikozuxedexi.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/18672426610.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/kagekedurisorukewumuwitaj.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4fcf99ca1e9dc23024ceb46a169ae0ab/44270980323.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nitj0ldv710smid1m0640kuoo0/15425260765.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/40054674040.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/zivajijigoka.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/finokeputazovuzito.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/10005709947.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300056405013.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/futexufaruvuj.pdfIn PDF document text
    • https://geniodelweb.com/file/zumedativogamarakowa.pdfIn PDF document text
    • https://anfauglir.com/images/file/zupavesopaje.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d235ef7ad3f---67622475157.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca92bba4---15837595013.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ea254406c188206d6a5f70728f7e3aef/pilekixazatabazekab.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/tenizufatif.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/wefevavofumolob.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10488 bytes
SHA-256: 78632608dccbbd9ca3ff419f3c6be096b4584de1ade5d945b5cff89a401a6822
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16608 bytes
SHA-256: bab1d3a7fa57a01b82654df18104b2911aa6903e06d98bb4f76fbdfdca9c9151

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