Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ac35c1d9f155cb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 01:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f4fed8260b080cfbb7ffe20b38d9e64 SHA-1: 5db4a6b055da88c98ce695bd87956c3340c4558c SHA-256: f4ac35c1d9f155cba7b670a6d22c25a34319126075688b5f0d631290c0673f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://wastran.ru/uplcv?utm_term=fatal+fight+mod+apk PDF link annotation
    • http://altadirezione-consulting.it/userfiles/files/87860946930.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/rolifosudunokidubow.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/zawujotuxevit.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/34983618353.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8deb748e---rufoxanekafudeketebu.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/torop.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/45546182582.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/50266735404.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090401115480554.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/13529136754.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/muzodobekebarodowogid.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/72565843501.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3eedf9f4ed94786a3460fc62e9db638a/58302489171.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/15695721689.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60006684028.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/dulofekumukipepibupek.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/rezumoxijugosanotol.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/luzuvusexuwuxazoromegem.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466c78e4a50---bamebozakijolaxumi.pdfIn PDF document text
    • http://geodez.com/pliki/file/13602071836.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fajuzuje.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/belesibifewikonisepoz.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/sodubuzomivezoterijibu.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/71910356475.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/3823765049.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 18876 bytes
SHA-256: 44dd0c3bc64da5fd374236d1ecc5565b627de407be7155b5144d00d884d54b77
font_01_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 10508 bytes
SHA-256: 24fa14458e9e77c47c97f4d6a107ddd4627b297cf3a3d1e262355fdc83d18cdc

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