Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5d8bd27a1af491…

MALICIOUS

PDF

95.1 KB Created: 2021-08-09 14:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2481dfb9bb1ab921d511823bcfcf7146 SHA-1: d29f55253522850b71a37e687209c67e61fab8a6 SHA-256: 0d5d8bd27a1af491d1d4ce29e40034c6176e335d750799dbfa10fa7ac966cbcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=earthquake+waves+worksheet+answers PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c88736357bc---xuxinubegimamasobedari.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/terupifosasidajuraza.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9accffb4f942bd0fc0f591c62b2c5970/soxamevunesutu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2499c562---62694463980.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/gnla7m79t40s9a8fapqshd9541/warojavugam.pdfIn PDF document text
    • http://kalikraft.com/images/file/pukixan.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f1fce642---12509800331.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210801_355928C630326071.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/65406772441.pdfIn PDF document text
    • http://skrn.cz/pic/file/85986138987.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-23/20210623161511668053.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8d88f253---nedavajuvipovigopotenix.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zupovepajefoni.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1a717705f9bcf36abb2086dfc76cb63a/34128594128.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108051406366574.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/15896040233.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41fb52c29---fomirixexixugozasimenob.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d33b7a23fe6---21291778024.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8875191382---18766368379.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4a62f3d0321b485ffe05b1117f8b9f45/sipimo.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/jizoromirinexugosopis.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/nujixapirotan.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/tipugemekevo.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_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 10540 bytes
SHA-256: 5b8b08a2dac3a7468a22b58b07ae43a6e14ba455d5f770df22327e4432a33b3c
font_01_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 16444 bytes
SHA-256: 37ca32e197b5a88f45cd69cbdc594f5c5e5a4ec10b36d532c4a2050ff536a050
font_02_sfnt_off00015570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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