Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b34254f62b147bf…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 14:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cec6deb24f6bf6125248f94c56c87afc SHA-1: a03e5bcbf3604c005621efd128eb2b68a194afa0 SHA-256: 4b34254f62b147bf046b5a6e871eeb8a7c12d5938f46cbf5e56591a7ded802e9
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics suggest the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=how+to+parental+lock+android PDF link annotation
    • http://getsolarny.com/userfiles/file/dujuvokonoruz.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bapiv.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gerolob.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/vixin.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fee3458be---zoburadinirerotolo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f9a0d4ce---94303969891.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444e8ca6b2f---tumagukaniwat.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/mexuxubobi.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/31379391593.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///fakawinozopizuxas.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/32828075356.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615174db01a6c---runiratuberejare.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/miperabur.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1632484661.pdfIn PDF document text
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/16556852340.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/87301654438.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rinopizutibefenebozujab.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/97799840172.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/widoke.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e68d55cb0---robikujemesigokizunozoj.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/8268000789.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f97beed65---xefetozoxefaxekitifasowev.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161541afccb4aa---57213328197.pdfIn PDF document text
    • 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_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 15244 bytes
SHA-256: 505909aa6533b1b51616f6e5750a022891195a7c72fb5988dbb3d4f6845c9edd
font_01_sfnt_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 10508 bytes
SHA-256: 37b7e91f9886ec3a3c3cdf8a673310cd9c8e13f84e1f53fe9c8b3fd5094e7082

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