Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766d66cf1d29006…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 19:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2da40396b031291c8dfbd8681f107581 SHA-1: 39323f1a1113ba9a9413c49404c50c8621b6a806 SHA-256: d766d66cf1d29006e303b549558166845d33cd9025d0bd01eaf09ad1a9a123ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://fortwashington.abwingsmd.com/uploads/files/tudozixoborigixugopidux.pdf In PDF document text
    • https://cityface.cz/res/file/59836438110.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/00bcad1f08cd937d984c0e04da3aa21a/59966681999.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/51801192334.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/60852753135.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/rakatidelegul.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/vebajarevusatejaraj.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/zaloxuruwotafitevojavoda.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/pujukolutiro.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/60952869723.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/615baeb0fa7f5d3274e9d15786c7759c/47499547307.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c55f2e5c---tikebad.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a44e91fbb---titaxufonatanatomigo.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/komiwolakotezojuv.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/83538515235.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/10054149444.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091214104373499.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/36341913389.pdfIn PDF document text
    • http://briztravel.com/upload/files/wojolaxesorefitixaza.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xutisiwagabakowekowigapi.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/bopuvuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=central+intelligence+full+movie+gomoviesPDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 18760 bytes
SHA-256: 95afc5bf5352ad3202bc4f75cf14055f309a45d65416fc4f3470a5da3c96ef5f
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10876 bytes
SHA-256: fdd4fdc2a2fb3e554193ecf082e00d48b4306f1e089383dfea1f17776b90e91f
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1