Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a232a86198ecb52…

MALICIOUS

PDF

88.4 KB Created: 2021-07-29 22:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9c66d28ee36ab2f729cc31e03696242 SHA-1: 2fc7838b9353a46b9c6679e021b85d2406c95370 SHA-256: 4a232a86198ecb523e895dd0f75f76616e4313a27c5c4ef92097169e7a4075b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tuderprogettazione.it/userfiles/files/jokekox.pdf In PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/47202736969.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606caf7c7db5a---zogavopixazo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e7b69a794fa1e3296a1fe8e0a1d10896/41228728902.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f3fcac644508805a376816018ef91b9d/naxufomirewa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h5om3gbao0muh7scmif49l6oh6/7311906031.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/61360376808.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2ae9b430---mokumurigukosewixozupe.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ba598cad---38916185044.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/viwesidurijewukomisurew.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nanugofubevuzutojorasunav.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9fc6876a5a920af7dd58f1575b5c33ca/derebime.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd0a269636---29643954058.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7f39r33nur7k6smdk7p4c18685/21038122314.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/26305595413.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035624079a---dolajavosozod.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a36eaab8---wugokes.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/befabaf.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/zizivovelojidogez.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/pesija.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/kirav.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/xuwelap.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/85387279486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=como+usar+una+maquina+de+coser+electrica+singerPDF 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_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 17400 bytes
SHA-256: 7548ba98a1c092e4d2dfec3e674de547c220268f9462a6320ba26d42c45322ad
font_01_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 10992 bytes
SHA-256: 5ff88db86bafd83eda2734923dc1773d4772138e7c138f43b97f0b77d6bf0da7
font_02_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1