Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe613fa62033289…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 14:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb441cbe1a80f86ffc7602ff48bf52ab SHA-1: 4e347d987b37a97c2d1935a12cfbd7d1be5e0f8a SHA-256: 6fe613fa62033289b008468581d9c79ff25da87430cecfb0a623097ae19557cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further indicates a malicious intent to host or link to malicious content. ClamAV detection as Pdf.Phishing.Trojan reinforces the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://greenlandpark.com/uploads/files/tawatenelaneladipuro.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e087b1111---vawolodaluwinetur.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/7399608126.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/80034612798.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/20415543334.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/86324452fa386356db0665b8851e11ae/munul.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xugiwixomupewiretigamejiz.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/kuwise.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/88940067786.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/77478322888.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908011022.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7mn5g5tmov3tnqukd2opme4qd/28763531126.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/sefoxasas.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/detexedunefesotal.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a8ac283e---mizafipajupevororofum.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/57085653290.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/pixosexivefikasuzifa.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/66784656485.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kizovujafi.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/19124207788.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/42153428252.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f582a602a59602de08a3095acf828108/17135615534.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/morivezusododejejogusego.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/45504100817.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/fe2e409ee7a8a55cc39d554b8f719fa4/10417980726.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210906_D0CB9087E3BFADE6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=blazing+sniper+mod+apk+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_off0000be82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 10928 bytes
SHA-256: cf13263ab34feecfbf510161e5133a4b2ed31534361500caaf13dd471ea8bad9
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 17004 bytes
SHA-256: 5eaa3b47c6b00c602b0e308a22622518c471764c374dac3cd5fe597844897405