Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25e5df892ca45f2…

MALICIOUS

PDF

100.2 KB Created: 2021-09-05 03:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73235607e65cf237754c1a94e1fb6ed2 SHA-1: 1a01a4681d1237c1f588fd0062c16e3849521cf4 SHA-256: d25e5df892ca45f2bf58fa6a9e6f2b1afbc8462449fccce519f1f2c4aff64e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://7sate.com/filespath/files/20210817002753.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/guganibufazitadidafosa.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/11839113407.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/fefaned.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f225c6aac4e---62355107198.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac16cdb68---xowobilabuwulaze.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/lawugadixaduvimisezimofes.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776b89845f5---23786389013.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/844308dfb3330d03bd20b6f35b601f14/matakadejo.pdfIn PDF document text
    • https://alutat.com/data/file/gunugojowojefidolurag.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cd5121d8971bdf741359ccdebbc5ff2b/xibunivomekadamidenew.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/melojobabozov.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/014773547e2ad2627b2920d2e068b3ae/xalakuxosuwowure.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/32c9214c182f7329b92567a3d4d3f37c/26131257891.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161113d5ae0275---46427380675.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/84922437093.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082edd2bb0ce---93683178275.pdfIn PDF document text
    • https://go2germany.ru/files/file/dedoleveje.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lufiradarakinimab.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/mmbu9tiao3v3ciab1mfh651cnn/sumepefojure.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160973e006cbdf---44968361853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=simple+english+story+book+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_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 19612 bytes
SHA-256: 3a854953c64919a414538a63e92303720291fb25550254eb11b94dbc013ee073
font_01_sfnt_off0001522b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522B 11204 bytes
SHA-256: 9bd9072552fcb94e386c67899d922abf6d9ce36f45311434c75fc9908186dfd6
font_02_sfnt_off00016bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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