Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29ffc272303bf01…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 03:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 342df8e5893f4c35d297813c5ede4b39 SHA-1: 5018c1936be9ab3807618c648643a2f09b26c0e8 SHA-256: e29ffc272303bf017f304719d16dcf2598b677e6ef81bfadfff5efd7ecfd0d1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=zynga+poker+mod+apk+android+1 PDF link annotation
    • http://zabradli-znerezu.cz/userfiles/file/nepifojazin.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/xifimebepaxuwozolidonaf.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/79755395456.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/jewetosijesopabalesi.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/99721166054.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/lolunasitibenoxumipises.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/681f4jvkrqf0m9qrc3325s2fd2/mokoxu.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/vujedexaxutitovowuz.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/39085988343.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/gojogeweriwot.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/vidomuwowofi.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/wezojalufipa.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bewebaluvuwidu.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/73296616214.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/muxozopegikasan.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914175254.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/83183509587.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/26cad1578fb5702cf15e7121a17edc79/54249823649.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/34940370260.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/45563457959.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16149835f4b0f5---wafakixuwamemirafasedawa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53a25296f---24966194079.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/95557277922.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/17801034780.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 18264 bytes
SHA-256: e198c503b0c76a45285c756246a9cd8ec870c05c04566d16ea19319226ca8674
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10644 bytes
SHA-256: 16ea98b72f1ca0df52209592efe5122189f899d856763b5eca67689d0b8eeff2
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1