Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad902ef02287dbe…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 11:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8154761c44184bdfc2403eae516d0be7 SHA-1: 8599d9ccdebc397094359172a5cec8d6038683e6 SHA-256: dad902ef02287dbeb7f6cc138f83b9ecdc92ef486736254c985c17917c26d3a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the 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 https://nomylo.ru/uplcv?utm_term=how+to+change+your+keyboard+android PDF link annotation
    • http://bahtiyardishekimi.com/fckfiles/file/sadaxokirijabunetarufu.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/kivodidomolilomu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091212102778084.pdfIn PDF document text
    • https://avflash.nl/upload/files/9517289791.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/11cebc02d5791a61acc68a43ea7457b7/sokot.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/46683147776.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61446915baf28.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109081745251595.pdfIn PDF document text
    • http://kelvista.lt/images/files/lalologozirogeburevimok.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7f87f1c0ee07fd89e0489aa7e64c096f/kexafixigakojit.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/96011552527.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/92111400338.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/womoteforikafobugol.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1062e74a---pijedekagixixagikujana.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/wevenawuzawefanimoxe.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/31893084092.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/14986530286.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/53319807336.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/jidumabifo.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/57426287813.pdfIn PDF document text
    • http://atomleasing.ru/media/File/44269241074.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86019846665.pdfIn PDF document text
    • https://5udua.com/contents/files/33883790939.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/26552235118.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/nejodojibupe.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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 10956 bytes
SHA-256: 9ce611f6b7cfbef19bdc7164b61cb0a6a7421b2bb7a635d48321f779230c09a0
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 17264 bytes
SHA-256: 77ab4e9cf2143d387bf999142d186a56e9404b30be70158e44c67fd109adb862
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1