Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ca55b5590d601b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-05 22:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 194250b7ffbfd440d83f33a0e5a595fd SHA-1: b81f5e5baef570ac675b42d713615e2f7eebe342 SHA-256: b4ca55b5590d601b51e9b116194b5ea45a61f1d02bce3a26655ec952c097ac29
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress uploads or disposable hosting. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://haustechnik-hagenauer.at/93466783400.pdf In PDF document text
    • https://betentour.com/sites/default/files/file/87168279526.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a69ba8fb86910f51f590f2da198383b7/sesigijirisuvevo.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/tatamutuvotoxurefapa.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/84273795703.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qectdaif1rv9d6etfl4enq1jr1/52823313450.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/82673932569.pdfIn PDF document text
    • http://scantech3d.com/files/78548299720.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/74725173103.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/mazaxugaripaxejewupewawa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dad8a9d73ba3914b5f7c01787065f8a8/ronusufijejizufedinugiju.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/31720251301.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/88e2621c878d44beab8e848da7dc66a0/vabelimalej.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702c9ae214---gedazagunasejalo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5485472f---xonubam.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/donopawu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/pagulevunuwederibamus.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/80276693836.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/regazifexe.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a4133af14f9---82629273397.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612465939bf72---sefazilola.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/41854012388.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/xuwodopomaz.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xaxevemogorar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=operating+system+concepts+wiley+8th+edition+pdfPDF 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_off0000b6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 11500 bytes
SHA-256: 7e12a244f34cab5f3d23633446fd2666c7050dacbdf2a8d15a52cbcdac9a2054
font_02_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 15168 bytes
SHA-256: ec7f559b52cd6f9d8f919217a57bfd97febd3f44057e88e03a61a70d6cec2070

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