Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb7f9838ccd3135…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 17:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79779f8c8885729c738bf7a8322d6b27 SHA-1: 817b2077b6730c009e08c09da2cad1bcd5953110 SHA-256: 7bb7f9838ccd313523cdf057d63c9228b236481d898c446330e480906fb84a42
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aftckwt.com/uploads/file/54152630182.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2d1170804654440351f42fc4f606264e/66199960258.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/winufudijikoloxonavuwiw.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/nokikifinepuxidixu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vd4ak98i8c8qupdnbg2boj3mk9/ruwutatitexadofibep.pdfIn PDF document text
    • https://artenika.pl/fck/file/gudumapumudedigutezeko.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/75277201958.pdfIn PDF document text
    • http://birdwatching.sk/media/file/11819420111.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gitisunibazerifowotimew.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/surinoloruleludepafu.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xepiz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e08a78825---japexezixijepifajesop.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/jivizewexafezabixolixeto.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xabawevupe.pdfIn PDF document text
    • http://sql110.com/pic/83616894171.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/vefij.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/vejukiburanadepo.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/ziwukifevowuteteduge.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/14099551873.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/xeredisib.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/72651224056.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/75554265765.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffa203185---31925247381.pdfIn PDF document text
    • https://durimawar.com/contents/files/43195344944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sonos+android+controllerPDF 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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 18380 bytes
SHA-256: 33eaf263e8649242038de9fd35bbb63d50aa453d145c271e8112beb534838618
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10440 bytes
SHA-256: df5a8d71602d916c4f4279f5e09121aa0c2bd82295248e2cf4a9743f689c03ff
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1