Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f12c7688eb7050d…

MALICIOUS

PDF

126.7 KB Created: 2021-09-07 07:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 215242f753765286a96e8eea2f40f263 SHA-1: 0e44802394c742192fa79d9f31b200bded6893bf SHA-256: 6f12c7688eb7050d05225eea1e3a7ac0b8b846d42de4f773cb3e4f5fa8e5977b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://driver-jazda.pl/upload/file/41685351167.pdf In PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/punosuwopeji.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/80495361442.pdfIn PDF document text
    • http://mousike.it/img_ins/files/27078458188.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/69571014608.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2cecdc9d6a66b27650bf4f8987c1a71d/larulipejufonub.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/59237018011.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b896bede37260dff255d3b21d64d221a/54742170335.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/fdb317b2be5c427859d5173bdf9b92d2/bikoperiwukosofax.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2dbk8fma6uv49jcekpl0911d3h/60280607210.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/neviximazowiborizet.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/48622464641.pdfIn PDF document text
    • http://cocoal.com/uploads/file/numidutojegabapedumiwokat.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8d5e632c1---67082734917.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6c8b42f1---67062500124.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/dudurizavi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e2f99ee2b9e85604da230a9f00f6818e/kexud.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/6253406297.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b8b5e8c14---58137688195.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/78965436388.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/39147438654.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/26218531464.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/28559432702.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/71295728254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=diagnostic+methods+in+veterinary+medicine+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607607f33acc7---64746657306.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_off00018909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18909 11204 bytes
SHA-256: be7555eb25794ecdc9ecf6d199ce37e221d81de42a9b1211ac01309863491c2d
font_01_sfnt_off0001a2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E7 19272 bytes
SHA-256: 49d7a678a11a3368867848e0c4c8a79b428a39e73ee412db7e3220a7949aa885
font_02_sfnt_off0001d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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