Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b71e605ab5bc0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 16:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dba26cafaf5a076c4332a084a6866ce7 SHA-1: c91507f25e97777599b9a5ed666f9db74ead77af SHA-256: e83b71e605ab5bc0f1610c8bab25df025829a6946529b9bdd605028a30d86ab1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern. While no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=free+fire+without+play+store PDF link annotation
    • https://drproperty.in/userfiles/file/32387864924.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/dovegixetines.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vosepire.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/67400171794.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba6773cd7---gakutameraluxo.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/68395815274.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/18924649720.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631889077bivajomipup.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wudomufolonogojotowid.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/vozimojekokagusizetowita.pdfIn PDF document text
    • https://pmms-online.com/assets/file/feliwogifedofotivagobadi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/av688jhl1dadg2b7ff89us3s64/vesagetesi.pdfIn PDF document text
    • http://wych123.com/upload/files/fatikonexataxo.pdfIn PDF document text
    • http://calisnt.com/uploads/files/buwixemadegipakemir.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/genixevewa.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/18919191772.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/75143757732.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ea74b473be895944dae3cc35cb99f9fb/4044454913.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vqc7hb227vd56bjjaj51g7acbs/14029730755.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/vewerenikazig.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/lolom.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/zojogaje.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/79165951150.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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 17676 bytes
SHA-256: 21aa49a426b6cd5ee3658c08160488ebc2e28df8236bc1104f4313ec02561ee3
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 10628 bytes
SHA-256: acfe2956ae6ccdc926905308c21da770e076da71e80d38cb10801ca732c98064

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