Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8c4647ef92615f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 14:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e863919d0f79ebc4a2da0757557decf SHA-1: b790ae2214023eca7ed56740916ed02164e7f668 SHA-256: 3f8c4647ef92615fe73cdb3dd63007b59a8959ae43e0743a0d16a160387c0f68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI and link farm heuristics further supports this, suggesting the PDF serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+backup+from+icloud+to+android PDF link annotation
    • http://joyear.com/ckfinder/userfiles/files/pudurabadibaliraribuje.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/11471454327.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/sepugefizorerenoduw.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27639423750.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20496500806.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/kovekamifoxuvelupekobi.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/90028820860.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/diwezotepexozibisuriw.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/585728701.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/77158723798.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/mefazosunuvazodenuzaxujaw.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/xuvikufifowuwiju.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/nirozutumofewuk.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/41101241398.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/59838137946.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/91015543568.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/c98dnmg845d8nl23fpj1nq5q3g/65777418780.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614f705a44e31---manexotunerupizeta.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092614540412.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/68190663527.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5bca7f736---21098005582.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e5fd7c310a7c2282c0262e0557587cba/doxiwenub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b695271d0c---sezimurawepawubiw.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/buvoxa.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_off0000b200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 10888 bytes
SHA-256: d90e0d66ef5c6a0b4c8f032da86e432e9632756d29be8a8d32e246d715206bbb
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16136 bytes
SHA-256: fa980cc44490446cf2d8f244b3c6cc651bf4eddf589b1080e1935ad570c76697
font_02_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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