Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7b1eeb09cefb82…

MALICIOUS

PDF

83.4 KB Created: 2021-08-01 03:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 595d61d438f14df45e3d686bf186e712 SHA-1: 0924d07ea67e6c0a04e72ad7b5f28a2e1b092ca5 SHA-256: fc7b1eeb09cefb82900c56274b410403e627cec8df0bb579c30723dc19e76946
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware delivery attempt. It contains numerous links to compromised websites, suggesting a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://huntic.ru/uplcv?utm_term=addition+and+subtraction+of+integers+worksheets+pdf PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf35667086---73589629422.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1257bb47a73b852b571f5f80a57869fe/rasaxafunolobo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hq387mjb8mdnvc8cfbu3gajvva/redifogesi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6deda323c0---riboxukizigojan.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/nobax.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/timurokavil.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/pobizixesuno.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p8rro9rbh1vhgcklcb383hkoe8/85381277247.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160704d6a0acf6---pemonad.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/dusekuxelevo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083598ecef06---75263086763.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da98c1789b8---76473910143.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/15548772130.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/jalobut.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15152769901.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a48684815b8---21502933796.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/29160499134.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83f99ec02---32960036661.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/jularejipop.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b135b171da7---57669709047.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/44769504456.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/bilavisuwuvazazodu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb657a21d---kilivim.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d801974034---2536773215.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 11252 bytes
SHA-256: a930a54bcac8026525ca65c152394132b1285fb13a27a79ae096a9a5ddcad956
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 17068 bytes
SHA-256: d75cd67201fb012fe01c8aa224388852abe3c034e78293c47762f80095614734
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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