Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ed1d1117631458…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 12:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a69198b54a38fa0e3e09fb16de47dc07 SHA-1: c5aada9ee7fddb4938a7b422d95461f1cc8872e9 SHA-256: 51ed1d111763145837d51434efe8f7773a6187e504f58bd04015c35ea1de34f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The document contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=videoder+2020+apk+download PDF link annotation
    • https://luathoanghuy.com/uploads/files/xitudesaledok.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/wavutigizumudovegulumoz.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904011802.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/82528837981.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eda1d7653708832fb5cf1804ad586741/55798766360.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a4354ab94---pilixir.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bisuboteduwelelap.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jopevubuvidimadu.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/sejevuke.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/rivovupe.pdfIn PDF document text
    • http://juha.be/_files/file/tutedaxiwogenitox.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/61447459289.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/82133725406.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/zerakuxoj.pdfIn PDF document text
    • http://hejia-ele.net/upload/53423094629.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498b35e4d9---tuduw.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fipafenaf.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/80261375233.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/lotowufojatixuralonono.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/8946717735.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fefipotedezum.pdfIn PDF document text
    • https://revive.fashion/upload/files/panuxaxexojunizewevejezu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c859b56a4b---81484875963.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 17944 bytes
SHA-256: 9153395004e496f3db91dbfb618d1460d9100464ddb66faf9990d02e3127b6e0
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 10508 bytes
SHA-256: 189119ee311325e6b3ebaef5c011f9312947696479a1edaefe00f1c185a4210b

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