Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c5b7fd5195aa39…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 11:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7b63f5119fa854070d0df9467912a93 SHA-1: 3d7cae8682a2b0b588b7a0a52209804f5a47c203 SHA-256: b9c5b7fd5195aa399d697ef37e105508a6ab5eca639a9405819e3e56a16034b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161394d0e8e14f---39332050987.pdf In PDF document text
    • http://kleinschadenexpert.com/userfiles/file/99945940827.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/tejekigurimuxutizelotun.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/98954722614.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e005964d---padawujomu.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/gekorofuwafepu.pdfIn PDF document text
    • http://benetalent.com/upload/files/33547532341.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031359416518.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/47418023414.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gixawexetewabevojiketomu.pdfIn PDF document text
    • https://codecs.ro/images/file/lefexewe.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/gemeluwoxawuju.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/99319133084.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/7136851631.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/gexubabonozurek.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109070038032802.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/46411147827.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb55580a4c---magovidinu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/libukixibuzosawero.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf71b742e9---87464472765.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mozizajojimed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+ash+gray+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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 22608 bytes
SHA-256: b01b5534bad60d7b1ea4cef7776a2607101002d55e15888fd54ea4b1067f683d
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE0 10796 bytes
SHA-256: 9eaeac52106e62108179913796f63875b78f030539076ddfeed29aea6c6439d9