Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aba689dfbffd59…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 05:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfbdcd419ffcd3a1bf0fb25532464c57 SHA-1: 2890c3b807f853ab07f05a71b8db4c7dd13c4e0d SHA-256: a6aba689dfbffd597e873057a5a87663861f35174a44bf8899fbf129969cb772
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, with some links hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://popnmusic.fr/userfiles/file/razokomaruwezeguxodujimo.pdf In PDF document text
    • https://evpersoneli.net/ev-personeli/file/697155967.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/95479161307.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/67166148897.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ebc72248---1863171709.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/78880380854.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/50021661387.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/1877170113.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/9036873966.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/barazuke.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/wegebefixizejesexuvu.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/genopiwunuxinakoke.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcqvc6lvbs3rvba714l2vms23b/7412387168.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613637a3efdd8---69691953976.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/99748514783.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/37515961163.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/35390280367.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/jutidesusit.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/1402456154.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/poforewerariwal.pdfIn PDF document text
    • http://fabtur.ru/upload/files/pawumoxabofup.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/sunojozasivujasekomole.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33147718197.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/86412144659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=resetear+tablet+android+con+botones+de+volumenPDF 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_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 17696 bytes
SHA-256: 731c50deb0ca0ee441f9efc4ac91b160b599441365eb4ee79ad131093631d0bf
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 10884 bytes
SHA-256: 07aad49521c463cdc0ffa5afc18b494c1844820f8ef4aa165c0095a4db621344