Malicious PDF — malware analysis report

Static analysis result for SHA-256 9342b07262cd7dc5…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 08:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83f33270a9234263089f6e9f3236021e SHA-1: 5d5400fb39dbd9e47b40ba6844fe1fdef9a3958f SHA-256: 9342b07262cd7dc59682a80441e201f2992f581751fa537430ad66c38ed1652d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://kingsauto-bar.com/js/upload/files/44681038512.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f6a781fd---bijakedatavoletosal.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/bogisewimutev.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/bewun.pdfIn PDF document text
    • http://metapolar.hu/tmp/13358262708.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1ei69108eqi5gpr0m0jlchbk45/zofebakesixorabetesixeg.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724251990c6---25991216334.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/lilubaja.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/valebima.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/18965049927.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/rarakowerulagotonaxok.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/banuxiw.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d4704548b1e184b0cf363b18b81b24d/desedulojugopofoviwuwunev.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1430d9e5---20885642859.pdfIn PDF document text
    • http://ruresept.ru/files/file/jerenufibibetaj.pdfIn PDF document text
    • https://basisangka.com/contents//files/jafigegugutadudeni.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/99515136182.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/lodukadevewoloje.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff66b76e8---getawekalizer.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lenuze.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/68363087151.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051117032999.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb19b7ddc---76053348556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kenneth+copeland+books+pdf+free+downloadPDF link annotation
    • 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_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 10932 bytes
SHA-256: a164e3826bead4c0813339a831a34db592b2855f2fed89c6e7ad3f9c6357cd46
font_02_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 19616 bytes
SHA-256: a6d959f8cf01b3b931cc978508ac15109abab58bd5a467641acd1d75b5ca19e1