Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d38ee710520bbb7…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 17:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b52d10c3cf6a90466e8e66963f9796f SHA-1: 1dc4e32a6dda01e2634ecddd2202492ea5976bda SHA-256: 5d38ee710520bbb733c51633b85b932d033e32e482b7fa1a80214da190801c66
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, specifically flagging it as a link farm pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs, while numerous, are primarily used to redirect users to external sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis to the document structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dujs3khvjllqcbqimo0tbln7b2/xofukudax.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/powukevobuzidobikubiti.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239be06f3---13313226414.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e25bd0417---18895407882.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/87460917190.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee17fd2e83---32636228335.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ed95c1a6---97450500491.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e508727ff96a5c8a12ee7a2fd88f38ad/976535707.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f28a448fc---dolesapu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c20846d12---siladufewawototijimumik.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093469e39861---rejatewaf.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d189a013013---99751515559.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084717d75982---29862899067.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c7baccc3d7f---57007803307.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210620075203.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbe9b3f507---23246691207.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/bagoposeb.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ebac70cd---64838086204.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/64d6e6af4a003834ba7fe16a2b0d0621/gepuvukifebevidubovurugex.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c113801e---14228788795.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/zudixapojefixaxisaroza.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/94240245052.pdfIn PDF document text
    • https://triosms.com/userfiles/file/karikuzawunekelagixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+free+activation+codePDF 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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 17360 bytes
SHA-256: c7ec0a0a423076fd95779b868ddedd3954ccc75ec268da77471b49bff2aa8d06
font_02_sfnt_off00014173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14173 10492 bytes
SHA-256: b3cbe88de5dc3448130c6255c3b5e9811bba6be8ef08e2e973b4fbc7bbb5d0d4

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