Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff518a202b1d9b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 16:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e4528a8a7c8b818d3c9b5b3bdcce68c SHA-1: a8eefcddadaa24aba8dd4f2461a0ad4feff4df67 SHA-256: 10ff518a202b1d9be89a2346ca3ebc0f100eb8b69f8b599536ca4b30895fccd4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload storage. The document body is unreadable binary data, suggesting it is not intended for direct user interaction but rather to host malicious links.

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 http://fashioneducation.ru/userfiles/file/17541316277.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/62fd192b813f0bfe3899148068a7eab0/82162868559.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/buzejulawofadamorimur.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/08861dbb3a6028dd663b0309289801aa/lonezifuf.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/84972738369.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bce89958bff---wulexekenom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f333c93ce7---dewosezosov.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/adef5d636d4a2044be651e27f078380d/30326269232.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/pexewipodipurakuxanot.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/24021451066.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/025f7dc825fd9c9277762f382bf4480b/rewalabelidaxemudufa.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cttev3qets86asiiccmv1s7lkg/zogudelagopotenoz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/90511803777.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qua8slu0psedv85lsflkjd3kd5/48198057782.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/cd570e801dd0b9384ab0bba689e27cf7/39844876370.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/1643299170.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/68079452152.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b9c37154---zobugawizux.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b561ff3d---25037307448.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/tuxaru.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763aaec4b42---47775761848.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/12379999817.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/53247852630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=etl+secure+mail+vault+manualPDF 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_off0000baef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 17588 bytes
SHA-256: 15e0bad07023cd793dd9b6116b1860d987f0f6d67b82097ab743fbccedf7e322
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 10420 bytes
SHA-256: 59fb20a5c9abefc22312cf7cbd9a570520d9737bb37aec1cb7edce5349d29cc3
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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