Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd0b0a117abbb2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 12:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 430c260c93c027c5a100ee54d92b4f82 SHA-1: ef740c5d623b699944a73923d98e15d322b7be52 SHA-256: debd0b0a117abbb29f86740a46518f9be3f74a821a621d24a11e66843782d361
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=android+klavye+programlar%C4%B1 PDF link annotation
    • http://phuocthuan.vn/images/pic/file/sovadigep.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16133dab20921c---26827476221.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/83303408863.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/23659991615.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/timulepafunuzedakazofu.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/lezirabelekunudosudupofop.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tosadujelu.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/48745157171.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/robovuvimedavunoduremume.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l5lcqgljki300og5k53dkmi2uu/jumibifikenajovekizagove.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/61756882037.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/lejafexituga.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/99130171784.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307041837.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/95476959673.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/16103184441.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xutiwifufetalaxuman.pdfIn PDF document text
    • http://nscenter.cn/upload/files/wajemubelebovoxaramoloz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a9ddd875e57e0c99c5874e4367450748/29005902356.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hc1itl7jrj9s6lphbsvknes8uv/womosiwenixole.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132154882fce---19424330049.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/gedutubolugov.pdfIn PDF document text
    • https://thehouseproduction.net/file/84855910001.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 18208 bytes
SHA-256: ddcbde1dd3fad610927e04f83798bea4d98cf573597871c97dfef1d288fcea5f
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 10768 bytes
SHA-256: 218994ab1f06a58910175394d045b491dc5011ccacc8b02a77bf5b2150cd3955
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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