Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c7647b88c176a8…

MALICIOUS

PDF

67.2 KB Created: 2022-05-15 09:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-02
MD5: 7cec78b6b406dae89010eca9071ae545 SHA-1: 4e9dd38f57962b0c3f05b78120e3ff847d796d88 SHA-256: 25c7647b88c176a810079c3650b0043bb2d13ec4aac1ac0f3aad5dc55e0540b8
216 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. The document body text, including a fake CAPTCHA-like message and a search query for 'basic physics of atoms and molecules fano pdf download full game laptop', suggests a lure to trick users into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/34912665803.pdf In PDF document text
    • https://gugukipibedi.weebly.com/uploads/1/3/1/4/131438190/sudaru_xezeradobav_videxovojalim_tesogigig.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2dnurimf5um3homp3nttaqktjc/jivojur.pdfIn PDF document text
    • https://niloberu.weebly.com/uploads/1/3/0/7/130739427/vebusewuvege.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fazanajugufa.pdfIn PDF document text
    • https://gabatilijoden.weebly.com/uploads/1/3/4/7/134730515/6650875.pdfIn PDF document text
    • http://doors.syskon.eu/ckfinder/userfiles/files/93407316147.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/mekevore.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/49966909581.pdfIn PDF document text
    • https://jelozenodi.weebly.com/uploads/1/3/0/7/130739120/9265703.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/f297fd8.pdfIn PDF document text
    • https://parewexap.weebly.com/uploads/1/4/1/5/141516222/eb868cdeecad.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1622ec864a7fec---52440630325.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/34047043863.pdfIn PDF document text
    • https://vanusufuxuw.weebly.com/uploads/1/4/1/4/141497310/2193391.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/46674821538.pdfIn PDF document text
    • https://negegobuv.weebly.com/uploads/1/4/1/4/141459737/fosepigepiwumi_kowowikamevot_mepaga.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/0cfeab20.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d8c496630b72b295c44abc186b782f6d/vovilemukutelo.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/radexaxenak.pdfIn PDF document text
    • https://ragaz.co.za/YmrXLWy8?keyword=basic%20physics%20of%20atoms%20and%20molecules%20fano%20pdf%20download%20full%20game%20laptopPDF 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 extracted file (font_00_sfnt_off0000a217.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000a217.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA217 16124 bytes
SHA-256: ea54f257f478c744c531f922dc3a10d216ac8784a1aff36ad2c1b50d031417bb
font_01_sfnt_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 11320 bytes
SHA-256: f79b626d89e3b8ac84a5f1f5d470fe102905fe6dace92d8f73a746b3a87a5b77
font_02_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1