Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec557f066ad4f42d…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 10:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ccd8da565e46d0543976f06a417b1f86 SHA-1: 2d2fe4961a0beda82731b294389e1c7145869017 SHA-256: ec557f066ad4f42d94a90e9bc55a9d1149e054d25ed8a1a0293c566c610ce5a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930a298f971---24469710093.pdf In PDF document text
    • http://washchienluoc.com/upload/file/dunitubakufukulivudafe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2atv3cb130amuoa4u73tsts1qo/ximerixo.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/fipobowapugok.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/59098246707.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35765329241.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/e04c00aaba859945ff465c6c31814258/bemuzilimoxilub.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/50008582956.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f17f1427c96b2d9abb31f6f46e3df8f/bumavebisumipowowunit.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/49095673638.pdfIn PDF document text
    • http://aven.su/userfiles/file/mometogakozumatep.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c1d0ef6517034e76c032dc49195e3f73/besutek.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/67590a4a7a470725a893f0d796ed1574/vibovaro.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086f79c5d03b---57880532013.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/03scv7h0k7taaqofor7hbi38rn/13799591068.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sevomilogapizaxigunut.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210803_100833.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc4c2ed76---govakiravakiluwupederel.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vuvodulupegigerijaseket.pdfIn PDF document text
    • https://rajaunited.com/contents//files/fenifodiwujim.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r9c1rktv8ejdh589nfapvthh92/67918950724.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/mugabaf.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/77153914114.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/lobiwukal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=critical+race+theory+in+education+syllabusPDF 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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10852 bytes
SHA-256: 91fea9ec22d4493a064b008747038deb689a9079f82fc0d85b6d590a0b1ceeff
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 17436 bytes
SHA-256: a8512c0f139f9077b3380ff9cc48b86a8c0ecc9485f97930f7315ff27a8e51a3

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