Malicious PDF — malware analysis report

Static analysis result for SHA-256 51afca447534f02c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 04:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcaaf8b77b833a8929a2999947626fec SHA-1: 3617fdee227e91c78c4d5556eaf548d57eb65913 SHA-256: 51afca447534f02c4b6b41d41b0f61745f4bc814e64f78037e2505cc8305b523
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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 http://ortopediaszombathely.hu/editor_up/renilukaxulagubedubas.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c867df564---36382791718.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/62250105114.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913130830.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/80647391274.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143790c10b21---43192997496.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71141001983.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/sedezafozagit.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/85445778811.pdfIn PDF document text
    • http://grupophi.es/uploads/files/bijik.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/wobetowetulatesizowel.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/pimun.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/36005380819.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/40927321080.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/dexozadutux.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161370ca162f76---94133029449.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/72967543790.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/venuzeranulifozux.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/3423279760.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/26720600692.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/4543334229.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fiwerapoma.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/mujovejewuxuzanimizuzufir.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8ca0a6217c30e5caa42190d3c304eb02/jagatevujixifug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=recover+audio+recording+androidPDF 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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10444 bytes
SHA-256: 1fb26ca8c3b81d44a08f5ea886f73febdcc2d1b972381a7788d10acaa54cd35c
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 19888 bytes
SHA-256: 435a3d2d8580449492b1debd69317497cbd5db48e7f780c7f7f3cfb069e501af

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