Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8851e834ff121e7…

MALICIOUS

PDF

149.0 KB Created: 2021-06-29 13:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 07747f9f20fecb9773a6a0cbdc73b630 SHA-1: eafacbdb0b7f1d9be1a873f0640de7b791467cbe SHA-256: c8851e834ff121e785355fb8b13f81792ffd0ee12805d74681621c781613610f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing attempt. It impersonates Microsoft and contains a link farm pointing to various compromised WordPress uploads and disposable hosting sites, likely to redirect users to a credential harvesting page. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://chcial.ru/uplcv?utm_term=can+you+play+geometry+dash+on+ps4.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=can+you+play+geometry+dash+on+ps4 PDF link annotation
    • https://accuratesearch.com/userfiles/file/66862361425.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j0v58m7ssc5plmko5pof8830kj/lagiwawepub.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/p765ldu3qfklkjldiier0dl5hq/femog.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fodozobinuwuzebirik.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3c168355e29863ae4d85c75040cd7494/90127288563.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1712789e3---jirasas.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/kutosozanibaxikuji.pdfIn PDF document text
    • https://isosklo.cz./uploads/99757180680.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c182cbfb0---wekenirabodenodavazoxe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2b7ace5f---lutesuwonorug.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6d8169e3ba697249c82ad864601f3c0d/12623900572.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e039949dbe14a7b9543c324d678c29b2/88937206030.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/fimivirasulalitiziwubi.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/60250581866.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d9a28925---4072053577.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a5905e09---78653407200.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/motulusabexitetavibug.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eff239fc---bivuxom.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s6vs8cfbmelqakkacakj495l3j/15218833144.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/7433034564.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fb5c687d2---63554673220.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/nerovuvasis.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3acf0beae5712e9a8417972d32181617/23549649764.pdfIn PDF document text
    • http://protok.pro/upload/files/25558464630.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5AE 11068 bytes
SHA-256: f3e3dd11e1de1f5c886d35102701222366fe6b01d7f3c2237bb8d73e8fd91e0a
font_01_sfnt_off0001ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF33 17896 bytes
SHA-256: 5f19ba9eee8350b08118d2a702711ca194650f662cd322aecfbaf6268e162af2
font_02_sfnt_off00022e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.