Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bbb529ef49152e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 23:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb418adac5dc0c1a748c727261130cc8 SHA-1: 62643dbb08be1cac674e6fd60a30b62be642e763 SHA-256: c7bbb529ef49152e33d26146c3c44e40eb5bb9205f379e6372e9eaa28497fe9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://starfoil-mail.nl/uploads/wysiwyg/5653837901.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8306f949---zilemakanibaviwutebajez.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/rukolagad.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bead8bd2996---favizeliwu.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/zomixiwimilokejolebiki.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/wuxam.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/s6n8d43qnurhr3372o4r24e5f8/94031161223.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/43412413464.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3n25egvmkkq5pqcdsho112m3o4/gebumuzibivuxuf.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/25298139710.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/57416316309.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/61160074554.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/36684839295.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/5206006926.pdfIn PDF document text
    • http://allycatering.com/userfiles/disatevefagosune.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/gipuge.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0391da3966---tejilaremujopilug.pdfIn PDF document text
    • http://elma1.ru/!upload/files/nerokizaretodipudonajak.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078481d89b9a---48381763279.pdfIn PDF document text
    • http://htwy.com/upload/file/xeviwapowiginimibovowela.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/53383873348.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607192aaac792---91049175132.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/75213ebeb3553cf8cacab610c5410a77/71913331756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coping+skills+for+anxiety+worksheetPDF 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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 18872 bytes
SHA-256: 4568580229db65f1f17e1b8873355b0114a8e80505ba4150b07588bb30d34258
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 11064 bytes
SHA-256: 80e8b1e33a75b061c04a73ca315e86f19a673569478600f610d2ce1f43be1225
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1