Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1554ef5f7390c3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 13:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec95aa77bff67af1f9ed1ba0f577efdc SHA-1: 669b2b7f7bb0be6d1b9647149d7a4665fcd55553 SHA-256: 9d1554ef5f7390c38569dbb32916b02e07ea4069731d5ab65795d9f5b37fc10e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://doosradashak.in/ci/userfiles/files/6591958685.pdf In PDF document text
    • http://bptramptour.pl/files/file/midasimof.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jititirowajifurijibumul.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/romevuwitobarodadelalawez.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/20440899659.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/16248217416.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f0c725e99356bd15d4f2b9b7b7ad2015/96745999847.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9308c8582---bikadovarumewo.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/91508006055.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/xigulevufewulupobuf.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109010431279051.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/mozufudatavipuwik.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/lanopepunubanogifoz.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/13817757379.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/910b674047a3d5c69087fec02754acb3/gipinezenawekuse.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/bebodiduk.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161423da5c0d97---nijumesasuretivovixumidip.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/sadogalojatorami.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/diraj.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/519276395.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/15790067142.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/numexebu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b5fd8f09---tukakedusodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=malayalam+go+movies+onlinePDF 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_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 10428 bytes
SHA-256: ff646aee059ab1d0dca84dfb990c8a298fcc7d91b78c7ea1afb711e20598f74a
font_02_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 17264 bytes
SHA-256: 0f88bcefe4eeaf3af90197225c31a7c786662e63f2653d84ea4790b347e93cc7

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