Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9675b22cb22586…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 21:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 980dabfa7e7ae9985747068264a9cdc2 SHA-1: 93132fe235fad80ac8cdb97d55fb32376039772a SHA-256: 7f9675b22cb22586a7af2861ceb0f640b806f15f5e5e338ac2343f217c1dfde9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/wafusu.pdf In PDF document text
    • https://vas-vill.hu/userfiles/file/wewopifufofone.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffaeed2cfe---83821923946.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a417029a7b---33776752118.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifosimosatixe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024209874f---99388484664.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/65827528926.pdfIn PDF document text
    • https://0900107678.com/upload/file/xumalazasosaselefo.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/91695702793.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/14806788888.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/4262195396.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/67141928622.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/zaporedupajabo.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/nufaniw.pdfIn PDF document text
    • http://sciattella.net/images/file/wuvuvomotofaruneser.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36813097524.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/61018397029.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/36217738804.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/lovekizusade.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349f70a6c6---65488053861.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/55900050494.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/39889834049.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/kibuwuroluka.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/58831838168.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/14152333539.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/xizobiwewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=invisible+pattern+lockPDF 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_off0000c374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 10616 bytes
SHA-256: 28e1f43dac6a860feddbe83e19d5778ae3d97637f1db5cedc72fa84aefad270f
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 18112 bytes
SHA-256: d2110a484c243cbd617350b91bf7181d4fa93f29246861947dc3829ea745459b
font_02_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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