Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e44de25578bb0c0…

MALICIOUS

PDF

68.2 KB Created: 2021-07-04 11:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec0d0351b8c16d739326425617c7d530 SHA-1: 336734fc7f87daa293b518b0be3973de34b3060e SHA-256: 6e44de25578bb0c072cb147da04fec04aca71a70940eacbb88d21efc16d05f18
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these external links. The file's structure and the nature of the URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/a668ml2u9i7qrd42618clsbj4c/kebijebesul.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084596373294---sevimexitamofupig.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vq34e6j1r819aot20a56lib3s9/majabuveruvu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab3cd9e3ba254052ad3078bd4b31fc8d/rebadajisafa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072178b78eb9---rixadotonimido.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f619e1a---11160824418.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ce4e05d81---16245302229.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/48e97502b93b296175a4b4c63122e378/80641152391.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/52957305195.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/66680907258.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/buvunakivinereposuwazakul.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/11342482509.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/kujodatatunizakiduzunatil.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97fe9ef04---bolutojek.pdfIn PDF document text
    • http://slsnn.ru/content/files/81828906619.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/66078799552.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a963b1ebd35---89314216411.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/20964913714.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d5cda6b97928b8676ba0dade7caf5c9f/dogadamukutikemifufiwataf.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5b5u98nv7j9kjarnc1i2592pv1/lodalegoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=median+for+continuous+seriesPDF 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_off0000ae5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5F 10516 bytes
SHA-256: 9909fdebf454ddba544f84275619040f6e8be1fe9437a21b3ce01710d1576520
font_01_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 14668 bytes
SHA-256: f0450e64654998b634b0925b64e3ebebcb69c54c3723f42cdee774e927da3a5b
font_02_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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