Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cd87995b931efd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 06:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6652ba01115924af049014370fc792b SHA-1: 2eb834f4e1fdbd14b7453d8683ddc451b9285331 SHA-256: c1cd87995b931efd34bed59ba8cadf25655628c4450f142e831945a70a81e28a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting campaign, disguised as a file-sharing app source code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=android+file+sharing+app+source+code PDF link annotation
    • http://hondatayho.top/img-ngocbao/files/32056340181.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/67656962715.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109101433241607.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/36964364547.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091301180670554.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a39e4a3---wenaxukufojodozo.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/totukibovo.pdfIn PDF document text
    • http://onlinevay.com/upload/files/2818311726.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zipig.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135115a49125---13471617087.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/2519683243.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/30813139880.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/nokidopoxivelotafanibub.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/87738747026.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/76210824049.pdfIn PDF document text
    • https://podimercrm.com/img/files/27092995731.pdfIn PDF document text
    • http://myslizdrave.com/soubory/18870542398.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/ratagofodaz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130503d402ab---zejebatakixidigesokikela.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/dateri.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/mapegapisifozukewomobef.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/xilakusafopogor.pdfIn PDF document text
    • http://gewald.ru/content/Files/88299203195.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143380ad0d79---bagezepopawiv.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/73341923416.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219181623197368.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_off0000be52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE52 16412 bytes
SHA-256: 421642ae0773a32b279b25d407ec6122d322a2e30338304e36a48b3db5aab81a
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 10884 bytes
SHA-256: 7b9798e3e47327073eb2a9d9090048e2bc04cc8d34ffaf4b6b7fe73cca574440
font_02_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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