Malicious PDF — malware analysis report

Static analysis result for SHA-256 542c0bedd657286a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-23 04:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a25bf4eff22eea4fa2fd071dd84bb50 SHA-1: 109d3fd5c1ae043caf92f35414e636fa52918b7d SHA-256: 542c0bedd657286aaa89107f8aaf1de8f4624415a81d6b6fd2de224a985d903d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. 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.

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 http://managhantasala.net/mailuserfiles/file/26997197016.pdf In PDF document text
    • https://joinvita.com/neu/userfiles/file/gerelalepironum.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/11571354634.pdfIn PDF document text
    • http://space-edge.com/upload/files/26648026051.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/16abb660bf9e601bff46920f03eb431b/gatinijened.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/28838172983.pdfIn PDF document text
    • http://timebymtm.com/upload/files/17173940056.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021912152119804.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/devuwosemawifedinodup.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/46a2ed3c48f504eefe9a01660ca0dbd5/44174345928.pdfIn PDF document text
    • http://briztravel.com/upload/files/26675568814.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f8447d6d---5666226638.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/fusawi.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/visazokirizupubalebamax.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/1782310422.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/77078822235.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5b5a00e3f25fbb9a51ac33030626afe1/47999538363.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xupivenupav.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/62998668612.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/fuzanaxudim.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161399941a4bf0---duxatufabolu.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/61899534293.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/50897446887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=backup+sms+android+to+pcPDF 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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 17400 bytes
SHA-256: c6da37e71646debec96b1edfea6dab86611012bb36c70cf10fecbbca6a7d06d5
font_01_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10744 bytes
SHA-256: 3bac867dc28cfb5418c600671d6c0560cf0039692fa886c91d0fa96426b3de01
font_02_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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