Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50a8c14007299fc…

MALICIOUS

PDF

156.9 KB Created: 2021-06-26 16:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 534e5c673d1553bcdbfbb7f4a3dc464b SHA-1: 41595ebb7e84a31941379f8406e4ffd28c916b17 SHA-256: f50a8c14007299fc260e76dbb5ac465583ee79a9dbbf45a38021eebb205240a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=saint+lawrence+elementary+and+middle+school PDF link annotation
    • https://contact-house.com/fckeditor/upload/file/56405851042.pdfIn PDF document text
    • https://bursac.net/userfiles/file/noxepesezelusudopaba.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/77460041048.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wovigunuwi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc04097a187---38052915643.pdfIn PDF document text
    • https://areicon.com/images/file/zeregeg.pdfIn PDF document text
    • http://greenbrier101.com/userimages/97887290720.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cb0ca98f6303f36a26e45dfdfe2d6ed6/xejobapavobufuxubutop.pdfIn PDF document text
    • https://puppometalli.eu/file/70474766522.pdfIn PDF document text
    • http://mesterek.net/tmp/rowodizevatedo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/xowupuxezedinuvan.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/04608b0c5de3339722bdca719d7fbb70/87010663710.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1559ec1a9709814feda4812352ae6f2a/dazax.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085937f165b3---guwiwe.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4b02da5735646392ec710b1f99729253/gugurisofirorakibokode.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/66dffb565502e82a0b3769fbbc158111/ramanalisajapenogeku.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/26668023251.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/74f26984d0910e408e098fdedd4188bf/joguludixusevo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/58dcbe0fd7bbad7bd70ee1dfecc37b23/82686736271.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/16295e22677b24fa848e7b6da246d078/98291162.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7565dc7c9478c71cfef39f6c5d8ed705/mituviwasulokovejopet.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_off000205c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205C0 17808 bytes
SHA-256: 493f7a7a2c7d0d05a3b70f3ff9eba09e1b3ce041acd4148c0a705ae2db18bee3
font_01_sfnt_off0002348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2348D 10912 bytes
SHA-256: dc839be800b5f78874548a9732b43ec874095d62999c2c97fc4069a6163e3e7a
font_02_sfnt_off00024dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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