Malicious PDF — malware analysis report

Static analysis result for SHA-256 52af202fb0936141…

MALICIOUS

PDF

106.9 KB Created: 2021-10-19 23:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c8c005d62ccb0a0449c9ffa49b8329e SHA-1: 6a27221ff674fd9f80e7f95a2da3843431cfd85f SHA-256: 52af202fb0936141543426cae1eaf1217436c87379a24864c5dd286983260ddf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, suggesting a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=ejemplo+de+justificacion+de+un+proyecto+de+investigacion+educativo+pdf PDF link annotation
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a1a7e8ac4956c6ffc90f48085754c87b/77715876512.pdfIn PDF document text
    • https://vzglavniki.net/data/file/5577733044.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/tetibaf.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/12980792268.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/3012232625.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/muwuwemawolo.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/14360418537.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210918133156.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/faruvuwisalusidixetebo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/lagefujelogufavoji.pdfIn PDF document text
    • https://thepainter.asia/upload/files/22012537365.pdfIn PDF document text
    • https://33mobility.net/uploads/files/bejosilabimadomufux.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/wugim.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/81807419127.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/bupen.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/vazukuselotalejulenev.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/lawovexuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616198e665c5b---37123896451.pdfIn PDF document text
    • http://hwayinn.com/image/files/20211012_023325.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/19517705984.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/ralakeduv.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/rewigelowizufawaxidanojo.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/belep.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/pomewiwufefimineg.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a09b60166953b3b280314cabc267fae6/63241837170.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/35eb2b7cb4bdee7869fb42db1d30a5dd/27947098118.pdfIn PDF document text
    • 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_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDB 21776 bytes
SHA-256: e8520c404a4af628076ad8cf0897d3ee23acd90c9b74ec693697dcf41cbf035f
font_02_sfnt_off0001825b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825B 11356 bytes
SHA-256: 920b167e8b0b41aa5924376046e174a89125eddea187c03b8bebebd789c6a9b4

Open this report in the interactive analyzer, or submit your own file for analysis.