Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0025bf2e9b9024…

MALICIOUS

PDF

88.5 KB Created: 2021-11-14 03:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5f9f17d733b59174ee64b3e0dc94e7d0 SHA-1: 48c6fd038faf06aeae912aa34a1a82ff43b30af2 SHA-256: 9a0025bf2e9b90248494ed16454e794de01d4f9eff3d8f0bdbf47c25c1274cf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://auswallendorf.de/userfiles/file/19109227814.pdf In PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/9331015901.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/pedopim.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/kijukisujuko.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/54647585722.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/verukomutigikef.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161815951582c7---35778168897.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///41702068347.pdfIn PDF document text
    • http://videlec.be/ressource/file/22156918437.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161789ad8300dc---23446327313.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/valoxejinodu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/16835127061.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/62676327548.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/temiwemuk.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/sdglpt77jo6qv930ho1i6lkrh5/xivitu.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/4271311702.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161773aa62c8d3---bukawizadoruze.pdfIn PDF document text
    • http://skisun.it/userfiles/files/kovudubozo.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/tufasoleguxobixuwofilirub.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/81297537917.pdfIn PDF document text
    • http://www.siposferenc.hu/html/galokagonaxu.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/77407391228.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/28471297376.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=west%27s+encyclopedia+of+american+law+edition+2PDF 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_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 19052 bytes
SHA-256: 3e51b0e7abea34192798d9061322f0f737495438280d4670c68ea8ff5dc898f1
font_01_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 11128 bytes
SHA-256: 07608322be28dc9bf9292379122f1530af51310e6207b579e936c8de44d28ecf
font_02_sfnt_off00013cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB0 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef