Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f570229656aa6a8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 21:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1288d0176f3fe0d80a31540123ca5a34 SHA-1: 8def395b4546762ea215bf1da0545931d20d68c8 SHA-256: 4f570229656aa6a81e4af0cbdb0757261434b08b1c6ddf28a49f3b485aa4c9d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm for SEO or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nzozkrowodrza.pl/uploads/editor/file/judedivogot.pdf In PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/55965682462.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488b7f03b0f---nokobim.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/wukiwofowe.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/13347799624.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/zafepupixogobuzus.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/jinasodogodumej.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/gojifoluwubo.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109192034336737.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/43879846939.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pugekuvamavomubalewemofe.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/vososifatawuwusatupepil.pdfIn PDF document text
    • http://citty.org/images/uploads/file/kixudubome.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328bce0796c---japalizolipiko.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/joxusewemulanilir.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/rekuwaze.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/76679458911.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357d45998d2---84482017373.pdfIn PDF document text
    • http://sunway.me/uploads/file/091614518126.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/65117266752.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/tiwazojuzolodovavajasig.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/minax.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/9198972078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+onlinePDF 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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 18488 bytes
SHA-256: e3307973acfff9a909f83e8137c14425d34a37eb1149eb1d4ef6b5c17ece90a8
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10992 bytes
SHA-256: 0069762fda1138a221e14fe0ff6b9f51af2e050403e5bb58cdf77ca38d1a99b5

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