Malicious PDF — malware analysis report

Static analysis result for SHA-256 65af379b91ffe3c5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 22:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a027d2af280432bae801589279ae598 SHA-1: 2ff2f2f7171cb35851637826df66ef7a60cb4e2b SHA-256: 65af379b91ffe3c5b10418c7a56bdf1d9b954f93fd4914d4fcc4c87101a4b681
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fake issues. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://crysiq.ru/uplcv?utm_term=murder+mystery+codes+2020 PDF link annotation
    • http://richardchong.com/userfiles/files/64184980402.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9a893efc---79863165601.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/54699997138.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/dosoguvoxolowo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rgd1dvf81se3dj2h3kr62a7bt6/resimar.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5ac5bc8a4485e5fa4fd097fdb7ce8df9/puwetadawobakevejexefiris.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/38659191833.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5360d99c052e06ada7b038614c8e68a6/36596447946.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/lutinuxolosoniv.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913203503.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/38631531038.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/3299902486.pdfIn PDF document text
    • http://samtekelektrik.com/files/vujizoduzutig.pdfIn PDF document text
    • https://finliz.lt/i/File/karigi.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/jizakobanexaxopowife.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b46e4a488---bisulogunemat.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/22894557010.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/45152592109.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/70242159068.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/zokuvibuwinabapiluti.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/wabenewusata.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10576 bytes
SHA-256: 28d102c68cd1c762dbab65f884842666e4a512d156639a2fd3069e096541c9ef
font_02_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 18064 bytes
SHA-256: 3a7696dafa3a7be00c2f6252b33d0cae108b6d1f75f976e53c0366bef575cedd

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