Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce2ae7ffe21d6a9…

MALICIOUS

PDF

91.8 KB Created: 2021-09-03 18:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7f8906906397c32f6f4185f8ced5167 SHA-1: 5956748839bfdfe2a7d65941c81c41edbb4977cb SHA-256: 7ce2ae7ffe21d6a9a99130a8d8b476265a8fe4c951f2f07a99d2439a22a45d0a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://music-summer-courses.eu/upload/files/zonepawimusijuwufoso.pdf In PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/mupebinavutupafenewapopa.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/falufagadivowuduj.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68b555154---sixajifaboxafogudo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/01qsmf4j4eetrnlugtlkjbt1j0/posibexenazala.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/36760582046.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/83136339310.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/fularopakerodovofifuxise.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e29416de7---77719103714.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0da909742---56216304983.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d608e9cb3b08629e376e4cb0ef8ad403/18850115027.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/kusaxolowemorujuzubira.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/68982995269.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5dfe435e---80632996914.pdfIn PDF document text
    • http://blatt-gruen.ch/files/zivarimomekelirupixide.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/52806003845.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/winufedugoju.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9be27e60820fd6ce11a91d82b17d752e/rijuxunixewabowa.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nvdraoh57lt4qvdon6rbct4440/wakekevazejejiw.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/83742324861.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/bebuxegabudegiwajumevaku.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34096549886.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/841247334c5a269831e2ac8a079c1f85/lojimopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cazador+180+utv+manualPDF 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_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 18288 bytes
SHA-256: 4a7d3983049955334525dc88f31556ba9ec8d32188aae7301b4b576fbafabd4d
font_02_sfnt_off00014946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14946 10656 bytes
SHA-256: f01cfba7b71816b20ae83813836173a58fb811c9867e385e9ed07d417a5dcda5

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