Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b45493ac967fc8…

MALICIOUS

PDF

83.4 KB Created: 2021-10-16 10:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e896b6833c4e16a8a68a90963530faa8 SHA-1: f27efac98561d42cd43e215685ccc54fa4f1146d SHA-256: 86b45493ac967fc8a7666c500edfd9bc35cb3cb1b51d9ce042f35c82fd095f24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://dsagco.com/Upload/file/potulodisikoxejuvamoxi.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/l81t2f3mlm6bbo2gq9jqd9i3qo/tunupini.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130690eab4be---fazolorewi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/00f47b5947fe18dbb66d1655be27d887/verodub.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/tafanefogewuluzutap.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/55141337547.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155710f539cc---rafuriporele.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/5033098812.pdfIn PDF document text
    • http://abpaluso.com/upload/file/49691058941.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/jowejikegezisulegabifatig.pdfIn PDF document text
    • http://rc-modeller.se/images/file///44552982430.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/gogufilukin.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/zarujozibelibemifil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614479f0e518f---49192413671.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e1ad471e3f487ebf986329ff160ce2d9/zafixalijidijaja.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/37993145674.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zitadebup.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f8f165a16b2a4e11ecf2f967b67ec1af/64652334583.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1615b397a125cb---49371817277.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-10-3/20211003231807797964.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911072919_OTUwMzU0NDcxNzI=.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/poliboluvo.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/15542307285.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/vituvidix.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=docked+and+dew+clawedPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 17884 bytes
SHA-256: 13fcb1aef6a9ae9c4a3e52b8cc30fe379f05326c2e8858d4e3e80fcef6f8a2c5
font_01_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 10084 bytes
SHA-256: 9a919f43da98008473b310870cbdf7f85d6c01f5d4fccd5de1413a68cceaa5cd
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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