Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c7d5d6fa77ee98…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 03:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 800243a5e87eded604aafb2390bba981 SHA-1: ea4f0e19e82298686f328a20650a23a041588509 SHA-256: b8c7d5d6fa77ee9825b7780348e3ad9d16bbd5d7c5d95fbdd54901862c73a091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to external, untrusted resources, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l94urc6a7nh3g4agrgg3in9ecd/44873415890.pdf In PDF document text
    • http://architettosirocco.it/userfiles/files/94820166520.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/33776682078.pdfIn PDF document text
    • http://klhl.com/userfiles/file/15461721669.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/81012828773.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wanexosuxowapinufodukevi.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210831_191803.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/52533018490.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/tuzesusopidumefegemig.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/13408062519.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9e599a38fa65a25073b498a5f09c8b8f/vixodadovufuxakage.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/movuzewezizuf.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/dopuxit.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/65136510606.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/97884704115.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/66663089612.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tarikuridoburapunorum.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/67806191809.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/27749890090.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133492ca1247---kefujigafitotez.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/69433828615.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/jebinixu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fu0l9gv7ve5ud1pi20n0epfbi1/94615412858.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/vufujuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=among+us+hack+ipadPDF 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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 10760 bytes
SHA-256: 9f5fcc3cfa10b1f5a7850f76cab727295bb960dcfe432415e1acbf0adab96f81
font_01_sfnt_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 17064 bytes
SHA-256: 79e4e58b4880099b9d06a9f017a4fa9ad16461a57b20e0ff284c766c3649dcc4

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