Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cb1b1d2a22c632…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 13:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d1269ad839543cc1b59544190623c1c SHA-1: cb2a559635f4ccc69c383ccf9aacf2651139d83a SHA-256: c3cb1b1d2a22c632c60814df5a39de6c44608e7b1f675368a96bee82e966ea26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various disposable hosting sites, likely to distribute further malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sicurezzaips.it/uploads/file/41336377702.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/40116357152.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/rizelisuwutebezile.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/98493591978.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904121636.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/50429011115.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/67d6580135ed613c5d1fada4fd33052f/18566465115.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161350c81d3508---bebuli.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/67741516111.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/zasilolajeki.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/4928807337.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/fasebarezetavawobovasub.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/29986564771.pdfIn PDF document text
    • http://platcometals.com/images/file/zafivuwusuredup.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/32826084dc572a78dd76f8b919e26745/ronabilazusakabiwonir.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/37162147431.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613956dc0edff---vitakefux.pdfIn PDF document text
    • http://w-mill.jp/images/file/logedakudeli.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/17869196723.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/30581159955.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/mijivumelutifokudewulo.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/rudebizaniwupug.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/46382215351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=one+piece+mobile+apkPDF 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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 18220 bytes
SHA-256: 93d1438fee2cac7bf1253ac458b5a69fbfedd7f93aaecac4dbc41339c7004b4a
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10428 bytes
SHA-256: a306fa83598f5be70af886ed386edb2f2dab279d784c71909cccd3f287048ce8
font_02_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1