Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb4dd6cc6981f5c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 09:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 112e8fa561892f6c7fafc1c8e6d21453 SHA-1: 79d5b4a0d332d1cda7d0daf9c811bcff1231adf3 SHA-256: 5cb4dd6cc6981f5cbc0fe69388b7886ca5f6c2b05cb56eb48f24ab8ea6e1898f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting browser vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 https://philabc.ru/uplcv?utm_term=pokemon+go+mod+apk+unlimited+coins+and+joystick PDF link annotation
    • https://beta.nhatthiengroup.com/files/uploaded/files/xisovakudojefojupina.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904203423588442.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbbf329ea---72027009859.pdfIn PDF document text
    • http://toroisg.com/public/images/files/badogulawuposumunudoju.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/xolebo.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/33256229929.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39b22c9ef---bilagogir.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/41496408069.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/lowasunerubidiwe.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/43521231412.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/gutoguduzupapupawet.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/92705138254.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/fonukop.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109102006395780.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/tojesolutif.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/lesotetewirewu.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/vegaraxurobupokitedoraso.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/79684042078.pdfIn PDF document text
    • http://cartopack.com/Images/file/nukekol.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c632bd7113---jovivipolilukusokikufogag.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108312130541062.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/3071315878.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/46594025182.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/22650164105.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/kaxam.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109010901041137.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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 11196 bytes
SHA-256: f9ab51b4c964ab9bbf5e7695db2d9d518262173fc276f13163f821ba5105d2ce
font_02_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 18068 bytes
SHA-256: 9b33d5f66fbea885c2823e13b7336b3cd569583421ffce3f608a32866bd719a3

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