Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d112c7906b837dd…

MALICIOUS

PDF

90.9 KB Created: 2021-07-19 15:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba766e0ab033f8b10c5f7439668a0fa8 SHA-1: b880eafa3ffb287d2eba9083f385a4ca4982da60 SHA-256: 2d112c7906b837dd70336b9ef978a0cbe58093992e01fe2f1c2e976fc6be7f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management System (CMS) upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zonwering-belgie.eu/ckfinder/userfiles/files/23761243905.pdf In PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/89110881274.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503164419856775.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f5a76134---74812683559.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/37879290906.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a9e0c290---zepotunikikerekur.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/95617900331.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/zigukufizukofijazimiriwa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/425923428de19fb6401b10618c8483f3/pazufolebizul.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/38342403896.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210703123319145.pdfIn PDF document text
    • http://netflor.pl/upload/File/36916672942.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/df967898d63f80a564d423ed8dfec8eb/24778985703.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbe8d8b451---12813627993.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077868bb1ed8---ludexivefazajuxirarax.pdfIn PDF document text
    • https://unosms.us/userfiles/file/mixazini.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e820f6886c---91228822151.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/kavemo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160715c99236f1---nanofimer.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d3sf0trtssc3c2j1bafviqqvc3/zeziwakuzuzibumef.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/37d3b161f31cd94b7664d612da9663fd/83167568899.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/lejivizoradugizirida.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7b5f34d3---27752107761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+sunbae+meansPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 2588 bytes
SHA-256: 2d0db98e89e1c864640cdc45494716da4750291e48133a79fd151168301ed4c9
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 10340 bytes
SHA-256: a6882a3e7fe968d4dd0312e57f4113dfeb9cc136d0c25a69c39206732fc39b5e
font_03_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 17792 bytes
SHA-256: 550e716c16918272878176f40e458cbc51ed28f4d2dfd484990a236a1047b7d5

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