Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c367e1a7b724fa5…

MALICIOUS

PDF

107.6 KB Created: 2021-07-28 06:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bf38db3eab152ef4f058e3acef1f0ee SHA-1: c33813d260b0d3bfdc93d116b2d214d4198c7184 SHA-256: 4c367e1a7b724fa5993584dbf501696fa11c5dda93d57b3481744e4d067ca0aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple potentially compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160722320ea455---noxefemoxasipatixibulel.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef1f1a73b---49541872755.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4f6ef013f49a8aa0cdfa76ffe181f1/zazunakogofore.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/wugipa.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/jasutaruzudomebumum.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/godelogilobadepa.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/30283924272.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6135299cea---83373480089.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831ee9cab7f---movuxiriked.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/54744752995.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e20ff93591f978d6aebc1bcbff95c2cf/10540361511.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774217c7eae---magesemimaronomu.pdfIn PDF document text
    • http://ttc-investco.com/img/files/liwepikegepunisagofu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/db038d007aac20ce59aac9049278834a/56485140231.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jajinikupi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5bbcaccd5c3d0581bfdec90c9df5d846/lagejabopa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160834b6f5ff01---fozananupusofowumunam.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff07701e7---kojuxefag.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/h1gudsshmelh7902c0pupj37nm/67631500164.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/guweduxope.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/592933282039fae6c3f4d4c81d574c5d/63370034432.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0bf86836df18ee0c33bb52fba670756e/fiboposamuka.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e675994c65984dce14d062fc17ff94b0/pawuze.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/ksqtgmvgq3s6vsv9jma5g3cktv/rijabudapaxobelogi.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/melebinejemifosirifozevaj.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/wirilenabakepowoz.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/fodaribujofegawujagupixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adobe+illustrator+cs6+support+windows+10PDF 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_off00014048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001585a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585A 17328 bytes
SHA-256: 274e2cb72272ffad72e2f5b02cb609302b7665eb9268323411ca16d454f9a7c8
font_02_sfnt_off000185d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D9 11156 bytes
SHA-256: f23e6a2db2422a3c2e45880b76318af33d93478f8ede92da2e3ef38c9bf08eb7

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