Malicious PDF — malware analysis report

Static analysis result for SHA-256 0276bdd4cf67e78e…

MALICIOUS

PDF

91.6 KB Created: 2021-09-17 11:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: febbb52245f6a6537196fd3bcb962461 SHA-1: 2da8658f7325c0d3673163b404043c8ae18d1c70 SHA-256: 0276bdd4cf67e78e80a1c04575a35c57209069d17dee8dafb94659981551ba9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the PDF functions as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM rule suggest an attempt to distribute malicious content or phish for information through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://machulski.com/public/file/fikudevofu.pdf In PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zudatokoraki.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/40096041493.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/vugukuju.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/nogesotesavozavovaboxak.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161355f7b0d74f---33874141463.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/79720608233.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/leniwabafarovitixofogi.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/16659971764.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/miwivufotiru.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tudof.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/83bcfc9966914f28aa53a9608c07e998/7750672415.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/96160701457.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/52587878873.pdfIn PDF document text
    • https://topupdana.com/contents/files/46782705283.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090fa71d37---wazomepikoxi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehietjto1f3uvmu7q4eqtqaqj/defivudo.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vefidefomefubinefu.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/tijatuduta.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/sutafogibavotopexud.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/51065154423.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/92652514777.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vepute.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/80514704730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plants+vs+zombie+2+hackPDF 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 16284 bytes
SHA-256: fde65c8cb77ea83157e3d1502ad2aee58f9d3905ec9a641983701f347f9e5115
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10872 bytes
SHA-256: e2dd4f9df13317156c157ed96896acf2415bbad9e8c0d318fb16b9d4c22c50b2
font_02_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 23680 bytes
SHA-256: c32e4a7c47832a817607e6ec04087dbacbfee30c30f3bb00f966055486e21123
font_03_sfnt_off00014897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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