Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c404003aeeab4d7…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 01:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c58b5f8adb1f3ea4df4796092b8188e9 SHA-1: 166743c897907b8c64874586368e46c9a78f786b SHA-256: 5c404003aeeab4d788d17b125f6242651b3c4204ca066933ba9953bb422f8fe6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=android+tv+install PDF link annotation
    • https://agrimal.pl/userfiles/file/14850183565.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffffba4b45f2d05d07bd8ecbc07928ba/91547736333.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/darosibawuzadojadujuvivi.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/puvagizosavulaguvaw.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/53212354560.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bewaseperoto.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/bepef.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19576102721.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/kabipomuvibedolanimeto.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/18218567074.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377bf50e138---nusodowobak.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457aef64170---turomidetada.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/poxetetupa.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/luwor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423977c7395---biboma.pdfIn PDF document text
    • http://obuchenie.bititechnika.com/img/file/gepajitekaseniranenadu.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/23506809469.pdfIn PDF document text
    • https://temahr.hr/files/6012242726.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/konikakonafukejidisamavag.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/04c2819689436d3e287e9f92e45c6f00/92501080447.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/28052631468.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/98575467794.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/gisivobikaxerumi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/872336021.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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 10156 bytes
SHA-256: ec9112c0026b435f8679d6e6c981a4cf73c2ab854605b7f0a43d4cb287e8084b
font_02_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 16928 bytes
SHA-256: 27fd44070dbecbf93977d8cd07151a5c7dc5b46604f0912df1f69670679c0e88