Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6dbe2badd5aeca…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 03:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10c1db1f2a8616ec2555d0cf4218816d SHA-1: 1a445aa9709e606bde1c3858bbc3b27fcdcbd2c6 SHA-256: bc6dbe2badd5aeca0326db6f88b8f12eb1e63fdc326b041cbd03325c3f12f3c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, prompting users to call a phone number for support or to resolve an issue. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it contains malicious links and is designed to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mujuerp.com/uploads/ckeditor/files/20210621151727.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6eced8ef265f299f9fbaca0894926818/96918823805.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/31351236391.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79442113932.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/39277779335.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5vf5nnr7h1ohnbasbejj80aum0/55882311469.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/191e04e64cd3ac7d3a5fffedeb98d0f8/kofedolesaturad.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/28484260485.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/231dfeda14200ae1f448d0de6d3bd20b/6291890705.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b920534983ec8cde15097169ad5f3c9b/wazaxomalebimar.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a30c121546920fd05c80a0b850ae4f66/volofamajixinojilalebafol.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/41bf14957cbd2877fa66c3d369cde771/gajaxara.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b9ced38c85d9ec5d1009053c1b30e7b/79087925647.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037bcbb430---59306104910.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/29772845895.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dk6hqf15escgikbgdqklki27bf/36368227019.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nuxufapokorikogiporovokit.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec21140de0---nudozetisosow.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/74315817974.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d778d976---62268885937.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e7d33bb3c89665d1878165fd14ef6794/72361870073.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071108758cff---44218947120.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba991d6dd---75682362350.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/pubenumajipuga.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/79419245717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+guest+list+by+lucy+foley+pdfPDF 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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 17320 bytes
SHA-256: d27fd37512578fef961b3117d92b0fe1ce82c1f8c0d77b945eda4d24e0560631
font_02_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 10852 bytes
SHA-256: 96cf77173e7786fecef1fdcbc75980c92b213f883ae0288d7ea4de0a7d7c23b7

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