Malicious PDF — malware analysis report

Static analysis result for SHA-256 805c95a11c6b172c…

MALICIOUS

PDF

107.7 KB Created: 2021-07-30 08:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a322ab49a23d598660155e3f69391b11 SHA-1: fb623490e8b4402b80034c6deb91aa1963a42017 SHA-256: 805c95a11c6b172cad476259592eb08391f7c6c51233e7066ff346f6c561f553
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farms strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=is+beyond+raw+lit+fda+approved PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec935b8a7---pabikukivijoluwizitofop.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/pafijev.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/41791430056.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3ef0b20a8054db6d1704caa4ccae5621/sufumokonod.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/7725937915.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/waluxobezax.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jldf61f1so80qn7rqe71qqal49/66035948396.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/13656367328.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5c1cacfee3e8770573594220d3fb9794/38738173477.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/uq0lou7osnt85tgnrktmlbpjh5/96871561569.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rukoremukoja.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/simivejemabivevo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b53d6088eb6---kaloze.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/usowipijavug.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/pajegupekeseritupifofut.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ad914aa7d093fc3aa58c3cfef46d319d/laxotadogas.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cf53491a4fa9cc59dc04a97ca017e685/92446688836.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/43759965172.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/warefutimupefenareride.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607024fc19ec7---tusupujulirad.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e0ebf6bf---tajekalasipux.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/genelado.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/86227302830.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 10848 bytes
SHA-256: 9afe5d320c6f9a5853a94bece0d8fec6bdd2556a1b07d2bdaea5fb238dc7f779
font_01_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 16220 bytes
SHA-256: 644c4cf2cdbc6b6c47c7bf521fac7744a686efe78999c5029991aeeb6944595e
font_02_sfnt_off000153f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F7 18980 bytes
SHA-256: 8cb59db612c39d412715ee6b0563755c121429070ce80b55e5de0e7660d23778
font_03_sfnt_off00018657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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