Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c459628b559f576…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7210570e89a248a56c76fb8543801f8a SHA-1: c90bfddbe3a1e80a12a8638a4d9485fce42f5419 SHA-256: 1c459628b559f5761cb005190844e3a6368ca215d7b10182ee80e02677588c57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The PDF structure and the presence of external URIs suggest an attempt to lure users to external resources, likely for phishing or further malware delivery. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4339

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://abwalabamaave.com/uploads/files/niliwesikalokafujebuziv.pdf In PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/jujivototumofan.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/wumager.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/butuni.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/85589883505.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7c9740a6f929e11677f9148c843e17e5/31443770375.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/zusujivixusiwafepifemilal.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/taxepaxa.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gufef.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/zatuzarek.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb39143d---44370810419.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/bopilozokigukeda.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nilazinud.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/fefatuwilipel.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/tajizolebamosi.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/81963034490.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xodugaki.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/81114911738.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/vesej.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/22786658523.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n3nllemqu4qseh4g9dord9ro7/83543316941.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed82b2b611---rajatetazubepos.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/xinaxunagenufuloba.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/lepififumurotasuno.pdfIn PDF document text
    • https://alkoplast.rs/files/josomipidipazogisuvo.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/36360717379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+browser+with+chrome+extension+supportPDF link annotation
    • 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 17568 bytes
SHA-256: b911c912bbf84b02b83228ea1b5f4400122d8f8ba47ba837b825d0115f1fac26
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 10980 bytes
SHA-256: 3b35a47e6471d76befec7820b7a1fdaf4558842bab8c26e4a810e63b57e858ac