Malicious PDF — malware analysis report

Static analysis result for SHA-256 8910d1b9f91f7f22…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 11:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb4c5f55b93de313e7fdbf507e8fa16b SHA-1: f9d61aba1d5e6edc8dbec3d72a41e50fd4974f92 SHA-256: 8910d1b9f91f7f22007a7850a2965973f9fcf37f7ff4b2a6e56183c50e15af1e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.lnk-creation.fr/upload/file/burozadorumo.pdf In PDF document text
    • http://hanart21.com/files/userfiles/file/67757692077.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608808846fd29---31563350039.pdfIn PDF document text
    • http://rld-carbon.ru/file/4380960005.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/27514527113.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5122d894cfa76a46f9b176b8e7c51b1c/66694908258.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0fadcbab4abbe65724da95da6b1995ba/siwawoxetapemevinalu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/18222380343.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/pasufojoxemelezubadadivo.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6094047819.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af8f4b56c---wemexofixo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da54dd3ef6f---nopabutimupizegej.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f4516f6c---67503262284.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o0kolt5damgtjhja9988t13aa2/nelibozisoduvo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f830fac21eee349987de35dedeeb28b2/65344222482.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a3e1d30b---gafuvowi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/063921933e0e66ed6828649f72dda513/tedemiwopidifosuvi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/f1d68bbf65383de8482de937e0f99f1b/welaxemediruzawedu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210611135004.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb205bb1f---63205924523.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/97902980804.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kobegunejiba.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608940cf22c5b---kegimogexosovevukas.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d0357e43567bf3a0114be236aa11a95/30876145319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=oh+this+is+gotta+be+a+good+lifePDF 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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10592 bytes
SHA-256: b53515c292a46191736ce6861e47f3ad03c70d74da62f0a35bb286cf8f6dbc4b
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 19004 bytes
SHA-256: 51b1a59ab8e236d136ea2578973d73355927fa39cd44ea94ab223e9d1fa3401e
font_02_sfnt_off000137c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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