Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54e58bb8a0b377b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 11:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5f53c352208da81525155dc828d349 SHA-1: 509786c09538f9845e40657d6d8936df8b30672b SHA-256: c54e58bb8a0b377bd933779ac33cef3453f1b20d0c402af266a70682d758b8c2
156 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 functions as a link farm, with numerous embedded URLs pointing to external sites. Some of these URLs are hosted on compromised WordPress sites, suggesting a tactic to obscure the true malicious destination or leverage trusted domains for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=connect+ps4+to+android PDF link annotation
    • https://n-v-v.dk/userfiles/file/xikojete.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/76859074090.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/nodoki.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/18282687565.pdfIn PDF document text
    • http://knipia.com/userfiles/file/14210426504.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/bekezutetive.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/63881172483.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210919001707.pdfIn PDF document text
    • https://maviet.vn/upload/files/lunopegemofof.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161366201a8966---dewezasibadugezokavubiwej.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142aac92ec2c---43108408439.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/sifowosopixipe.pdfIn PDF document text
    • http://snft.ro/media/file/fixotizenobili.pdfIn PDF document text
    • http://punaide.com/userfiles/files/tolamisubuvi.pdfIn PDF document text
    • http://na3.it/misc/file/97116332403.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614258772d52e---vududalobofiwufotiwi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/leguzulurapobutetubu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dfd996120---325578789.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zepip.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/sefodumepawoli.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/65390314005.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_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 17476 bytes
SHA-256: c4f81852964daa0bd48b51e92d5354a431e0c8ef5309c61234fde2ba7996272d
font_02_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10568 bytes
SHA-256: 4878c7fca65a84e985af9f2536cfd2225ccf45ba4f15a4ad2a66b3576110dff1