Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b5e8069c7539b1…

MALICIOUS

PDF

91.7 KB Created: 2021-09-08 05:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2373d909f8f7598428698ef98408e684 SHA-1: 29afd77e7eb1eb8997882fbd9052f340af57d0f4 SHA-256: 73b5e8069c7539b107d7e6d5f65907a8136f15e80149110986ab3ad8a8abcd81
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The presence of numerous URLs, many hosted on disposable or compromised domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78f5bf1180---85840380100.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a75417f3c10---bojenejokasujaxunutu.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/27497462212.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/28267813085.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e01aaebac---59109160241.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/pulikejagapa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a20dacccf18---nitigabom.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423a1acb97---13276249221.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/73703819918.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/92084554602.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/39896995383.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed8d88a2b---97456594672.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e215dfe9---30458566723.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c979b7b334---valumuxugerinubuse.pdfIn PDF document text
    • https://invest.pl/userfiles/file/tupisumo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/60410218475.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f4ed5fb84013a96b9619a33d56e407ef/42008336511.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/wuveradagekitewagowawog.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/53587112929.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/94301402784.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/fc190b2983b00691566d4aaf75998a91/59255032421.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/53842789767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hibridez+y+heterogeneidad+cultural+pdfPDF 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_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 18852 bytes
SHA-256: 8e173e75db1cb9b79dfbf295e26df70a9e0fc6b91e12831f9d83c5e9da5f9306
font_01_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 11136 bytes
SHA-256: 0d8b7fd1c632ec93fb0b0fc8241c239f6ed01e524f94a1f346bf4f49c0fe3522
font_02_sfnt_off00014972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.