Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41427547a0968bf…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 12:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 921faa07c99282c7a0bfcf69f3ca3f22 SHA-1: bc6d8359009dcee8f512a4cf56fa4be53aba2dfa SHA-256: d41427547a0968bf315341a945f8139b4d2f4291c2bf68de2adcbce8016a75da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, potentially using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=best+android+app+for+voice+recording PDF link annotation
    • http://www.parkwaytransplant.com/media_upload/upload/files/sosurinamitiroxuva.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/mutedemafate.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/25b8af87dadaeeb89f29a9d941b11954/kafidetetewuti.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/30791210211.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/33540697315.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/jexitomavix.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/13327086996.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/widotufotametugaxo.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/sevogabitubegojakotelijed.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f043d48393---lulirateve.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/9311132731.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109171943597312.pdfIn PDF document text
    • http://vning.net/filespath/files/20210913114555.pdfIn PDF document text
    • http://tcihk.com/userfiles/550451945.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145f6fa987ff---48223934256.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/94039363416.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/65169655311.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/88042053649.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/9859934127.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f6eacee43a91bb3ec6ff0a34b3364b19/42382077097.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/38234625116.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/zedojebuxirewetoxawerojuk.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/57645275916.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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 17296 bytes
SHA-256: 423fdb8189793bee40baeeae2d731267d2df92fc1338bbd69205f898029a4873
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 10868 bytes
SHA-256: d5f3a7d4e107e2c1f1423c816c966e568070d64033451e38a5c497e0bef332f1