Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2a83dc48e1db99…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 18:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b670dbec58110bdbeb2d8d39de479a82 SHA-1: b147126b300443f4713955b1203a9ee729149945 SHA-256: ac2a83dc48e1db9990ce5800b3aa462e56d2b9778e5442470932cf5b5cf3d728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96086321322.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c92afe3d632---6295987383.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/tizejiroxarakaxirivo.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/58453064268.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079e19a9a959---molopotozavuzofupotoga.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/56111492901.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2dcde715---52279167406.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f07dc570906---69203546479.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/52297848148.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/47815070306.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/jirinonosutafeta.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/61493335865.pdfIn PDF document text
    • http://paliukenas.lt/i/File/1693708889.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87a7d50e2---losuviwofage.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/14645147755.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3883dd92---fajepijumo.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/86c7f3d48328e8d0e29213dfd1d1e007/jesolab.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/menenawuzos.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/bd50ab07ac34a0bc1ed85f8408ce1f25/gututig.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/faxisodiluzulosevug.pdfIn PDF document text
    • http://chromavials.com/d/files/bawusawarofigexofowijekev.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d544e9678a---73502870653.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdb5471a0---basosiriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=que+es+una+dialisis+pdfPDF 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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 19696 bytes
SHA-256: 0a91cab97439c025721421559816485314a4984a3f30c082c38d2647abb9211c
font_01_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 10332 bytes
SHA-256: 652f813d2772e91aa6533b1b5703865ebd5f41258f007bf985da07a29cc58e28

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