Malicious PDF — malware analysis report

Static analysis result for SHA-256 668bbf8926e2f923…

MALICIOUS

PDF

71.3 KB Created: 2021-09-14 09:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bebdb01e26c53be11399503ed5ae125 SHA-1: 9fb59e943432dc04ecafe46cc8db07555b0413b9 SHA-256: 668bbf8926e2f923b7274458b2530b0ded1c6a5ef07a6dbe710e7cf4382e9dc4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF document that contains embedded JavaScript and multiple external URLs, many of which point to compromised websites or disposable hosting. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or session tokens by mimicking a multi-factor authentication or login prompt. The embedded JavaScript likely facilitates this by redirecting the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://allytemp.ru/uplcv?utm_term=msn+com+hotmail+sign+in PDF link annotation
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/17769869929.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fivodededewaxolodunodipu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0dd449e2660dab47635fd674215e605e/safewafetujovolawerutuxug.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9367e106f---nimarujojiradaxed.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7e7d1be3a40f1af97ade1f500603b7ea/17223829412.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6945b0f48---zasozivemuwomabupanugi.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/fowufuzazasebarew.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///18440243627.pdfIn PDF document text
    • http://gerocuki.hu/user/file/dopubavemubevudosenogatal.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/65740323192.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sezebijubogudujexeniko.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tekimeduwikojaxanugakadup.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/jenetesubiwaroxofurabega.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/kuwidulazofuxiru.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907050317.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/makapasitotokafububuja.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12532251253.pdfIn PDF document text
    • http://polletnv.be/uploads/files/migafopaxuxosifab.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jovenopuludoxuroraropoz.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/43351996936.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tokovadijejoxutasapu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/27977941940.pdfIn PDF document text
    • http://186086.com/upload/files/janazerajupikotugagun.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/64763759711.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_off0000b926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 10440 bytes
SHA-256: 4d1051b31dea742b09f8cecc2863bd199321bec3d54a46e60056633729adda52
font_01_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 15200 bytes
SHA-256: 96855724a3f21fde92429739e813cce4a7a331bd065d18a42a14a65ae9b40507
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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