Malicious PDF — malware analysis report

Static analysis result for SHA-256 0920a54bfea2c1d5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 08:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 663c5ab8e0b77b29733bc243d4ec0f28 SHA-1: e3576dd1e147a61ca80afc276ba2788691e273d0 SHA-256: 0920a54bfea2c1d55ad09203ff735453c39c2e0b77b615072f22c075f99264cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs like 'https://infrive.ru/uplcv?utm_term=gta+5+fan+made+android+apk' indicates an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8328

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=gta+5+fan+made+android+apk PDF link annotation
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e38d8b09061b84598e61d39c7141fb4b/51880291783.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608639378845b---putorateredumo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dexotonirusimu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be8c9d9a31---xedonasajudawerik.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/96407270129.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117fb43760ce---46434670139.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8b310c670c84b96cb1ea0d44b606b74d/31602418261.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ic3ru325hqbkl945r23s84f594/3539245715.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wiluguvavewodipurebalovon.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c46394ce5f5---matatabozizogupasikobuji.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3dd386eeaf0b2bae3080ddf606fcca87/jikafufopu.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/64422919926.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160944418a3d0d---59560244875.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c171a3e59d8---gigabed.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/31823232341.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/kuvilakibirovime.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/72798445055.pdfIn PDF document text
    • http://mariancozma.com/_user/file/putenegufidawumudamiseki.pdfIn PDF document text
    • http://rts-3.ru/upload/files/62125453341.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/80662360270.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f4783d5e---3738316325.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757ead5b85---55343227310.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/64269008476.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n2fp7pod1k7vu3engmm29vogu7/26307063915.pdfIn 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 10712 bytes
SHA-256: 4d026e59e9afcbdc055f7effacedf5f4dbbb8539a3908290fc1807eeaa82d742
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 17516 bytes
SHA-256: eadada3e835cbe5cfea7441c2d4ee05ce6009167fb26a2acbb9c53f6d0acdc34