Malicious PDF — malware analysis report

Static analysis result for SHA-256 81654b28c06aae1d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-30 12:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8ea04a50def53f5b63646d3a67cb5d8 SHA-1: 30e1a72bbcd53d7c1da3150f6357d2d1df010d51 SHA-256: 81654b28c06aae1d6a6cd4c0339166c6cba4911046bebbb891186c5efb544e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous external URIs and link farms, with several pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • 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://laborke.ru/uplcv?utm_term=legit+root+tools PDF link annotation
    • http://talleresjpg.es/img/file/bikujujapokodutamaxatusev.pdfIn PDF document text
    • https://robodom.si/files_vsebine/wekoriv.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/54104079616.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/50484683441.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/47841429539.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gifofemaxugajiruzupaviro.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/kederijenafosun.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161442e2abc97a---bumenolipa.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/19763538825.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/42117740330.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a08b6e983---73820090047.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/5583291323.pdfIn PDF document text
    • http://i-physiology.ru/upload/45495002426.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f75015da416d3c54917965756e418310/52874019966.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13955237251.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/torukutem.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/40869930595.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/75266927139.pdfIn PDF document text
    • http://airsoft1.ro/files/file/wotuwokaniruz.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17a387f80---74195790793.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/85314626079.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/4011531458.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/mubogoguvijujux.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/5179564237.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/54727230253.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/nojigifovomufudo.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/86073815506.pdfIn PDF document text
    • 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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 18724 bytes
SHA-256: 3e347ed26ddca48bcc7bcba5d903dae5d6d0296298b8b3039aa6936a6306eb7b
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 9972 bytes
SHA-256: 1334208bd8deb457e559362e529358b7ea8f070adffeeaa83254e1ec9c8167d3
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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