Malicious PDF — malware analysis report

Static analysis result for SHA-256 c291aed672046cd6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d3533d62f0443bddd6ae7637783b28a SHA-1: be7056ebd562ac3150844d5916cd64dd03048986 SHA-256: c291aed672046cd6a3cc78fc0dc4833baf8d277336eea6c688f147b99933d13d
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. No scripts were extracted, and the document body was unreadable, but the URL structure strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davobogomowariwaxob.pdf In PDF document text
    • https://conexkarvan.com/cache/fck_files/file/27828277906.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b237e123b6---madavetovinoxiruvu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/21288474854.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/24531495724.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/68034584165.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/9839755742.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/50638657046.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/jedulevekoxikepuxof.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/kozitaxinukukuke.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/54270318143.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161371c97b59c4---54066267723.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/xupikanozetademolufilape.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/govoki.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/metekikoxewi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e6af052686432658f802e23365cab3c6/88308161122.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/91623540755.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161348c43e1bbc---lorajitutobamajor.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/vegexakezizoxilu.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/65644864447.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/13560559785.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/26121727245.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sufevibesega.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/vutosivefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=use+cases+programmingPDF 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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 17688 bytes
SHA-256: ebb8cea725ee4f9be037f4d49259ad226404ced104046f3fc94fe5cbf13d48d5
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 10580 bytes
SHA-256: 889c04dd8c9383ee27dedb5577e67829cb0e5d95d0d17f9e59be18fe1123f002

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