Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f72f14883eb971…

MALICIOUS

PDF

93.9 KB Created: 2021-09-08 22:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cc41312b31e789becd621fcce7132fa SHA-1: 902502334d1008a9d7219f793168dfe2046f4755 SHA-256: a6f72f14883eb9715f1b9f9b40653da0e03a89cc58aebfa1fbb4c3a6527b3f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613524204c537---bepijetexisepunanidijozo.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2c70f505---1890711957.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137954966a79---44919638991.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/vegipadinesasiz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161349f9106fa1---82363247124.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zaledibemopurenafufol.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/95550934317.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109081734493265.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/12209272278.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/roduzidiminatezinefumizu.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/sinasojelimizob.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/runiletigotug.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/juzabefijemaga.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/72961717708.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630886483.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gonobujofudedodamo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/napimepipumekemoxipiwa.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/mobuxotusojemupin.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/68786901600.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5673290233.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/lofodokexun.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/29328873904.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/sakega.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/94231051992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sauth+new+movie+downloadPDF link annotation
    • 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_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 17580 bytes
SHA-256: a80c351029b5ca3746b940c4f57b65ec4cb99be9d5e9af098da0de0cb8f36c40
font_01_sfnt_off000139df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F6 10572 bytes
SHA-256: 6ba0914c1dc3d1b8357d1dd5713de94c625ee3735ccc812486009e9ccc0dda0c