Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1328f2803102c63…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 15:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec7c8bf0a5c6e0e1315019420416d62e SHA-1: e601e73a72d6a3e51843101cd98348291867d009 SHA-256: f1328f2803102c6307656f5e68372729abb2a244aafcb6f661ff9fe0c302ea3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous links pointing to PDF files on distinct, potentially disposable domains. The embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2299c06726---pabipupugamelugirin.pdf In PDF document text
    • http://didopack.com/files/69394012404.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8af54b746---52129655848.pdfIn PDF document text
    • http://etkenkalip.com/files/jupoxawaxexunobelewagof.pdfIn PDF document text
    • https://vestol.bg/files/file/jeleselosat.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/48571711895.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/jmmqth2876u46qo59d68mjm096/52954729303.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/mutudixisowerezod.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/19401226666.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/kovilumixorarewof.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/6852532399.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff2eb74a14---96917375169.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/jasepawasoti.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/39225007193.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b89703293---2853749287.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/98333555641.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/53883801649.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tntnbofgitk5qr7irecu3979ii/telugusobomenelozewi.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/52627214200.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092968f9db19---jivuminutof.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/36308445751.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8e04cf51fcb9998bb8a8331ab8bbd7d5/47902191024.pdfIn PDF document text
    • http://accronline.com/userfiles/file/92365337740.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeffe019b6---diruduralotejuweveruxuvup.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607345c8165f6---15767348266.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/16735992799.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5456bf341c---fezefisilijosatugowuxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ihi+manual+grease+pumpPDF 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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 10532 bytes
SHA-256: 0bb442a3fe965abef19bcfcd69ec12b5f2f64b89d457f173ec3574d4a19475fe
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 21548 bytes
SHA-256: 2ed405a9d64b25a3972f157f8bfae50bc1aad9708dd59bb95ce72cfb29e33f0d
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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