Malicious PDF — malware analysis report

Static analysis result for SHA-256 8572b2f2ca2a5f32…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 03:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7b7dfdc92bae22fcd62810c4c838ec6 SHA-1: 1a439d63d102c96f6810d1b23550526f2bb88a62 SHA-256: 8572b2f2ca2a5f324c380327cf0b176d5b5ae290bb003ebc1fa021ad2671da45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to distribute further malware. The presence of embedded URLs and the 'download button' heuristic suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ucue28sg86ele1cp9faahg2qj3/5618333964.pdf In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/u5ua4qi7tkdce21mmbroo74p0u0iieaj/64676940242.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2ec770761fce2e5ff7efda36e39b88c3/92392519791.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/29308289602.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/3842647272.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/19086544292.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/62053696007.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e64a9483b---ribademorowa.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/17464701707.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/raludiwufirixo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/loziju.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54de141f8---lijej.pdfIn PDF document text
    • https://t2sc.me/userfiles/11411739884.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7dbd39ae---73268775432.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gumaxa.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/46296496715.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5afdbe58b---wobunogofanopumino.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c572a6c25---90766371947.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/tagor.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/parof.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fuzut.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/kewubesefidopogef.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f97460c6bb9---36370826774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manufacturing+technology+notes+pdf+downloadPDF 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_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 19956 bytes
SHA-256: 6184150d2351c5aa63ad54ccb5eef5faa3b6875189f3f53a963ce38556e30a58
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 11192 bytes
SHA-256: 16855acee4c1da3ae197257c23711fec79e770fa45c3705040bb404187c8a3c3

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