Malicious PDF — malware analysis report

Static analysis result for SHA-256 12174acf9300bf24…

MALICIOUS

PDF

86.9 KB Created: 2021-07-08 01:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58608ad7163d0202be69a3b17f996d2a SHA-1: 7e87aea5305aff71c587dbb13721a0f886371301 SHA-256: 12174acf9300bf248e73547096351e62acd35dce2542825238f2b787548e3c04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://narcisse.sk/editor_uploads/files/komomureguxatudejavixo.pdf In PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/jeximimexufu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/7prvq6mniieg4oh5491ios6gb5/7295648976.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nojiwusiwibevubitomutejow.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/xinotevonawoboluwuvux.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/63340961970.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/67553039471.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e246a587---tuximunimawilonapiseriro.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4c0e1f40---bavusab.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7d20acb4---xotogawane.pdfIn PDF document text
    • https://wineart.online/userfiles/file/zufibupanekeka.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/nowematadebopagovojafik.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/zulafenusubotolapivu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mugn3lvtt57mk3tk7rbguvf784/napunesiwaxowoponunalipit.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o6h8ipk060p2pufsr1kuj0lrcb/35571280915.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/dekoluti.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/38c495cb69ddeddea5d68300fe8883d4/vimiworikopoz.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/47170289389.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098986815a9b---zikoxulowusasovama.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/joxurid.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/he0bt3mo0j3gdfd6751ps5nt6o/6553934067.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/nodalorulavupisudavanimor.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f92b08434---35465745595.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xevudejotimimarita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=i+want+to+be+a+stay+at+home+wifePDF 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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10624 bytes
SHA-256: fb36b8514ae4b4a4957a7e2d7000361e2e1d530785f67bbbc94b1df128bef12d
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 17460 bytes
SHA-256: 3ebb547b65e76855fb24c4367921a58404e54985ff0f642533d8fc993637ef03
font_02_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1