Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b229d1a53eab08…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 09:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7151c5ce7d7ba316f007d03950de1f4 SHA-1: a4110ccc4a2885d0fe2649133954ad2a31c7826d SHA-256: 47b229d1a53eab088c17ace085388186a1d0f9ca46d35faf592b1f90505adbfc
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://struttur-arch.it/userfiles/files/risakemunixawafefila.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/10675930239.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/55406062488.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/36285877576.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/9937850356.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/mavibowivafuzeposefuf.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/050232351599.pdfIn PDF document text
    • http://ellev.fr/upload/files/rebikomufaderif.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/posoruriludojulirasag.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12984469754.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2da51a136af06db7e17a23d847a6c40e/9371646201.pdfIn PDF document text
    • http://sql110.com/pic/fuwilesu.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/dinunewifarono.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/pujagarosudumamuluta.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/87496241912.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/xebiwifujejumesata.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613104cae548e---pivekired.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/42753920338.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/nowesitijilodavog.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/ginewotujok.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/41869732420.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0ae16892f---daterededobuzuderibo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/gugulomijefowoxetuzulofe.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/37484596041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=xender+file+transfer+app+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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 18408 bytes
SHA-256: f4e86b41ef9eefb2befce29a5e28e915fdb850f1b358d5a7df4a368d074187a5
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 10584 bytes
SHA-256: eee46379cafcb84a35b75c2ac6a611df46a8b9f86756dcc462efc4d91d3f88dd

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