Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf9fede9373e3b9…

MALICIOUS

PDF

90.1 KB Created: 2021-07-02 21:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3424510d7e65e26ca854d3b1a5ef218b SHA-1: 1a2d8aca3f21d5e2091e694da898026c278c9d46 SHA-256: 3cf9fede9373e3b9c0798d9f7e89d3d27b8e5e34db262dfad2bd8a32669b2702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d688cccc7fac3ff1130efc4cc55e9040/valixikilosujotenoxakuse.pdf In PDF document text
    • http://fittbike.hu/files/file/66433444978.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95f586a27---31693041433.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7cbbfc048af5862dae214dcaaa91c049/sunuximav.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/giviregiwawuro.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/95956999247.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b6478dc6435---zesiragixezopij.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/81051929452.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/faedc98cdad5ff913aec7ac48481d4b9/zasufuzikivatukuxuj.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/koluvitanogunometirepubu.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/29/94414281547.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/54537902650.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ar5ukrl8e7j29ckk0p87jk0fst/72535017420.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/deridetemexemotefur.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/87258459629.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/21868304047.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kugaxadirigesotasituz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc74e4b97a8---60279890615.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jurimiwodelumimategiz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd5c4d6644510c4043641675bbfd062b/kulubakeditexumokofo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9940d616a---15404685453.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0c2f4af89dfa2ef6bcbca1967dc81c35/1541179876.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853b16272---24429785945.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/wadogizi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1762dcef---fajajupufakatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bpl+microwave+oven+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 10576 bytes
SHA-256: 4aefb75d931d434360adbd4e7ed48226f98ce719f276691c87c41c1ceb4dde0c
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 17508 bytes
SHA-256: fd07b4a6e903f1c0bd96b28bb727b81a2ab80ce2989de2e03fa6cca4be4406dd

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