Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64b17ef130d64ca…

MALICIOUS

PDF

97.1 KB Created: 2021-07-17 10:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1196b27fa260985e492930e2e253b75a SHA-1: 2ff551f84f975a9cbcfa161f11018d3604d19a44 SHA-256: d64b17ef130d64ca38b15886eee264b58305298a770b0b6f33caa79147236c66
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://qianxish.com/ckfind_image/files/96053745285.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609420956e624---sutewi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0129c642---72647846286.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/86306722998.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/88553710754.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6dbd58a57---muravefujuzepimise.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/doxapefosipetifumose.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bb6c81a7ecff002efe5663d985f5847f/vazarovutuxenolotaxibexev.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wufejipifesigemululizid.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9731a4920d---73396894627.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c243f960b0---vomafugomitoletuzalanaf.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/vinotut.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/gimara.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0105b5510b---52631516724.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/3200303712.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/v86b4t5qpd9gnrn6kncko4sgo7/pinaduvexubu.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/65898106537.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/6i5nvitg2jcv5936u7l55cqlil/mawigapisivuwotelijuket.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/92578110110.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd71331403---60937775304.pdfIn PDF document text
    • https://akvaguru.hu/user/file/moxubatafep.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/vazetafuxasi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349cd53402---51158039460.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2ui2b64hu6131e9mshi5m44k73/dapojevuna.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/dfb7bb931b74b47eef272a421c4cc922/98148193722.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e787112dfc---38113874446.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd58b1da1f---zomaduvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=clothing+niche+examplesPDF 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_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 17364 bytes
SHA-256: 3f93519d90c81c5bb99ebb279325153b4b150b809536204658cfe3a917e0a0d6
font_01_sfnt_off0001449b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449B 10852 bytes
SHA-256: a185d9cf1f531715554d4d6991c66c0ee9cc2ccd21a50b75a093a5f332ad4580
font_02_sfnt_off00015d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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