Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbf56095f18bd1d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 09:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acdd02e00c0959194edac512b4615c4b SHA-1: 1087e355dfcc166e7f4eab7eecc15c57553c0e81 SHA-256: adbf56095f18bd1dd78f5c5fa9831e0bbc80ed2ea0136b2fc1448251458bae44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to provide a password for an archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://coretry.ru/uplcv?utm_term=pdf+password+crack+online+free PDF link annotation
    • http://www.puhito.hu/uploads/64992926910.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f4844f98e0f08be834f8d71d5c8bdbaa/23281039866.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5ccfc07c49a394ccd925ea4a43a17b94/kemadaxugirepifalagexo.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/88030374022.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/82661303039.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8eb76d60---dikusipotokumepejavivem.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/juvavawubit.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/57692485023.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5ruslt1o8so60r210059robm6/xovaletexa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/632447dae407fd2aea9716944ea3849a/23978000635.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/976b2d44v570r68qdcr2v308h8/gemanixedisezanakemisipim.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/zurejavezajera.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9a6eca12d801f91871c7f773c18af3ea/kelamopurobinixagegoreme.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/nisomuzamepuvoxozaliloj.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jefelewifipuzixe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4e66b6d77b28441588e669493d1384fd/fijus.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ec7e72be321a4573ab4e92d041ca979d/3519239736.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/gexexowijewaloba.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45828374832.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f9d78e15---9028816996.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/resisesanez.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/89142747231.pdfIn PDF document text
    • 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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 17068 bytes
SHA-256: e7fa65156981a01c2085e35a31150b42c90883d1daf78daf22eff9098ab97ab5
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 10692 bytes
SHA-256: c7beb1464c0d785134bf7e7242336a18f9bd9f4688f833506e765ab61be3440e
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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