Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a3ca5689476c5d…

MALICIOUS

PDF

85.8 KB Created: 2021-08-18 20:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11ae44df72ab0785ed4ce0e0989fbc7b SHA-1: cd684470933e94e7ef58d6c7c2e4249ae2b28fe6 SHA-256: 82a3ca5689476c5de090f5e14fe589b1b5fbbbe9166e6dfbe28779b9f7ab531d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm with numerous URLs, many pointing to compromised WordPress upload directories, indicating a likely attempt to distribute malware or phish users. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://thediamangroup.com/_images/files/zojikujujobegesamonadanip.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6d222a1c---16351971230.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saruzotoretat.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/45633a8fbeef8189f8830a2b5b28ea87/gazijivurofevozi.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/22988853339.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/49565469874.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6b6471b8b25dbe02395128f2974ce451/fevaxopezi.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/74356606837.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nadoterivewonabopelivuk.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d714531f9---donixutupozurafotarigituz.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/16629980886.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bf88f6dcb0f2a3b90ba2535f909e32e8/witopawotexivufewut.pdfIn PDF document text
    • http://mobiliteit.nu/files/94235934557.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcb3fd84bf---gudokubex.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b0989f7ec03afa49c851d8e9b6099735/xawomawajuzipe.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0a2ef792fb18b8f3207971c00bcfbfd7/6915243437.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf8f6fd0f---54816000753.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/68773023680.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/594b9c95619265c7596159d9a69ccdcd/malexafebobazuzujix.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42c3b75b---89835870755.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ee3316aa974e5f19da738d25e9105eb8/tafogubopuk.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609004ee53f8f---wedumuwum.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/36883636473.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/60845773310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+chore+chart+template+excelPDF 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_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10356 bytes
SHA-256: 3b9b75f4a8ab38cc681e7959afd5c0269f7c0632503ad4577b37309af54240dd
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 16452 bytes
SHA-256: 5f323c017bb5ba7ac23354c23ca79e37c8dc6bf1e64d6495c7371c8f90f9bd34
font_02_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1