Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99667181f51ef20…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 12:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 047da6e27b7dfc20f7721639dfa4e9ad SHA-1: 03a6b31a4be48f353d4dd9f2b1820df9c5479d5b SHA-256: b99667181f51ef2035eabfc4433d44894da8d123fbedf4dc7f89dcb172f5c1a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8fd2846b97a4472817ee71d87e0acc30/55819048412.pdf In PDF document text
    • http://daieimotors.com/js/upload/files/82830833551.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/48758162226.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/vuxotobataxizasemesiguv.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e6d7c70d70693d2856a39cde44405d34/ganazinudelenusikujaxajis.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/53998780824.pdfIn PDF document text
    • http://contua.org/userfiles/file/79271736366.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/kabezav.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/zabegopexoranakemupo.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sovad.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zuxinobeg.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2747381679.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/37523052111.pdfIn PDF document text
    • http://myesen.life/userfiles/file/40267263345.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109120206376399.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd9f2c671---redesamelomoriz.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bemopubabopufox.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/2456085744.pdfIn PDF document text
    • http://domosplast.hu/files/file/pogelakimixorazonezoxudo.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/wijujokiritinawog.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/12745329194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=my+hero+academia+movie+villainPDF 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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 10544 bytes
SHA-256: 72bba53323510d31672bdeb2976f2900c5ae6bab9e5db4ebd607157e475b3f4b
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 22152 bytes
SHA-256: 5faa12698fb61e1ee96316ad98abc5cf062291c459622d6c9ff964057d4b7baf