Malicious PDF — malware analysis report

Static analysis result for SHA-256 4639f7eab6a5c6dc…

MALICIOUS

PDF

93.8 KB Created: 2021-06-22 15:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7ad9b483fd0aa1b6ba375e1d60c3255e SHA-1: 3de867ecbee126eab107941f04b2060ab45ff32a SHA-256: 4639f7eab6a5c6dcb127d0f375c86966aedab7be8022a96ee0b5bd03d0cc57f3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/uplcv?utm_term=download+torrent+client+for+mac PDF link annotation
    • http://virtualcharityevents.com/vce_cake/files/files/25093447079.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fbf3a3586---jezagewatimo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d4c5b3eef90cab8622f72dfa7bc1be9/47553175836.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/76qs42ubennmao7uqc8r04g5mk/92035833882.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a153c2b1---jigigifawad.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/cecf852e803abae04224f42ab88cef60/51994976860.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/feadfbe35ef897d5b33d21258b0976e6/reviwusuzugumatodekez.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e9370083af5b85f94b775678928d3c9b/2153853825.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/61189860720.pdfIn PDF document text
    • https://manenshop.com/upload/files/50340403045.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xirefelas.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984ff7a2885---22429863663.pdfIn PDF document text
    • http://fullx.net/files/juwojo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f6a2461cbcd004fe2948f410e24364e6/42152407302.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607453175184c---13881067406.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vngud99sijppkf6j4e1fc2ju8n/xitevopibuxojevon.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5ad5d603643ed7c88cbfbdb0cfab29f4/14005828947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 7088 bytes
SHA-256: b28d1b9163aedef9b438b9541bef36908ef10087928fae94857c8657182193fd
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 5080 bytes
SHA-256: ede1634a91e5d334b7dffc2b03093365e9fd4c37c3e1d7d9190d31ba3f007c03
font_02_sfnt_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 2512 bytes
SHA-256: 699e2e0c6549cdf048f8583945829963fc79e927f0ac8765c93f021dffae84cd
font_03_sfnt_off00012d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 11300 bytes
SHA-256: ddd7e5caba2ce3edd7efed2e397c2b209f0386b1aeefba1b035aaa0d2f441433
font_04_sfnt_off00015415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15415 16116 bytes
SHA-256: 3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849

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