Malicious PDF — malware analysis report

Static analysis result for SHA-256 351694134400abf6…

MALICIOUS

PDF

95.0 KB Created: 2021-07-19 20:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 984bd5724f9e3020d2a2b2ce44b4dd57 SHA-1: 11f0628789ca0a49152982d407aa933b2b99652d SHA-256: 351694134400abf62cf501b5346b57b5dcd82f6e2e0e02fd1d9268dd8ce0e871
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://canadanur.com/resimler/files/89921847951.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/744857d984d574d60d03b55d8df255c8/gowevakedudejit.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1ea710fc---8459729833.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/81237048453.pdfIn PDF document text
    • http://alkanboya.com/files/file///81574957833.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tilobojono.pdfIn PDF document text
    • http://health-bridge.in/upload/file/32400919278.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/zupadazeroniza.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/15f540a81e5a36d6c87af1a57bf4b69e/46285396833.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5908e80ff5---finonuzelagowabulosose.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e612e421b43---sefizetuzamavoginofaxeg.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dolulizogepapudisalideda.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0cc6a0970---87410309329.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9813bc0---polinikipane.pdfIn PDF document text
    • https://beliangka.com/contents//files/59336205628.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/23775800418.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/laxala.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/toxajawe.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/32529160253.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/relunarikelafalas.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/zimaxalunadukedeka.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7195b2bb---titusawejukowurusireji.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607509447adc0---11791243879.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7a2719d85d76e1ff4ba88440da9441f1/zomefamuvuwerofi.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfb4101e2fc1f04527996a52493bbda0/91726174452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+primary+treatment+of+bronchospasm+isPDF 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_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16912 bytes
SHA-256: cda200d2c9d0bcb2a747ca2d73011c21945b3fce386251db00b351fb2efbe9a2
font_02_sfnt_off0001559c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559C 10916 bytes
SHA-256: 6322dad5303ce09915f535631f7d2c22baa85b98e21e90bdb627bb067f564a99

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