Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41e1339ee7540f5…

MALICIOUS

PDF

78.3 KB Created: 2021-07-14 05:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3efe35dcb604e9b14edbfe3b640b93a6 SHA-1: 18df328f08a400d5c6818a939a4f90c921bd6282 SHA-256: a41e1339ee7540f535f1116cd3d051fcf9d39dfbb0356728fd0ce4ae3ff83edd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment attack.

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/enr4ivs7hr2igv906k9uqa8020/62144483466.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160819b3edcdc4---53543486480.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7envhvbkg81hq8m5ao1lv2i1i4/42732577073.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7jed30opi164dlhst42fqpmqic/wisoxovifiwinaw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7qbj52dbmi93km0e0kui88t1r9/mejoxufatipebomew.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/10939404545.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc07947c5d---51782139811.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/de42c73e71b5a2523e46d1317d444550/26375474689.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/81906593829.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/13217330137.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/dubajikurufobulivo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fa43e775d---96420749772.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30f0ef187bfec2114c5816bb3c8f921a/76908067026.pdfIn PDF document text
    • http://aven.su/userfiles/file/fexegabezade.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a52b06bd9---59383502460.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/baljj83kpu2t0u0cm3hs04mjb0/41001810793.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/8594780726.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765670d2289---xagewegukixujibesugube.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wazakakujimigaj.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/95c2b0eaed72537576300ff5abf1f335/55862559954.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/dazojugonixe.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/runowelodesadalel.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kumifekajolifisiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=around+the+clock+supportPDF 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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 16580 bytes
SHA-256: 3782abbaa9f544296a037a71ad662d7b3042d841eeecc6d5c4af6ac7a82574fa
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 10532 bytes
SHA-256: 345abfc97fd4a86b36d2baddc43c893c9a0f637cec0b55ad7e8101e0347dfd03
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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