Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6af4b4df6f7f97b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 12:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2eaeb0f9781f1aa4dff8343a28e4c817 SHA-1: 05ebcb6826e6e255d02dbe3ca18f78f362a26f17 SHA-256: d6af4b4df6f7f97be532a84ba831bc13bad2fc5ce69156d64f49f258054ab407
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2818

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aldurra.ly/images-editeur/img/file/69361067599.pdf In PDF document text
    • https://silga.ca/userfiles/file/zugamokekupefezarowog.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/wuzufefudopowumopiwapoxo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bdfab785cf56a16c9d55ec9163dd2cb1/17081455532.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/gewufuvavegototar.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g1a3uee1kifqoic60mgrv740s2/detefoxunogaladoser.pdfIn PDF document text
    • http://mp-journal.com/media/file/81636476598.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f203ddc2---najifazada.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8c0bdc2b---74787838855.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1d5f4441a84c444f781ae7e3d9ccff00/gigesowivofutiwogirexomep.pdfIn PDF document text
    • http://biomisszio.hu/tmp/66154129727.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9ac340fc---62524069379.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c4147407---zubefuz.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/478m0bkv3922fobs5mcjusdvg1/xiwobasaledaxonuwa.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a8b85591---49674914276.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/986aaae5e1bf65c4623724a77783f934/16497662097.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e9db9b8a---seneloxib.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/wurer.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff62deaf97---xedazolawaxutexumev.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/gunoti.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/28422938527.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/xuzaxogimuzibunikota.pdfIn PDF document text
    • https://lazerom.pro/media/file/70856889101.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ceec233a3---senajuzakefodexataw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=domain+and+range+worksheet+%239+answer+keyPDF link annotation
    • 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_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 10828 bytes
SHA-256: 9957996cbc2143f163b1a88b7ef29b6e13f7f623105b14250fd92f9be2ce2d79
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 18568 bytes
SHA-256: b08e821e0ec6e20a1474f930a8142b7965aa475333556fbd43bf8d82ef0b70f8
font_02_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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