Malicious PDF — malware analysis report

Static analysis result for SHA-256 76df1e07e8d6772e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 08:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ea8dfeb7aa6bab7ff6fbc502ebf4e845 SHA-1: 7608d58f983d26e9538c5ee223ffacf7762e8200 SHA-256: 76df1e07e8d6772e3e1c8bf8bdb6f8c24c1712e88b7131bfb5e57d230f3aac4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867b28bed6---zojodiwakidazadajaneje.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026578568d---sutenipekow.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/77558704652.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/vuwotifakuloj.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/tukiva.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/31349740361.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/ruvidaraxa.pdfIn PDF document text
    • http://enricobarraco.com/files/80765314211.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/07s5ijhr5t2nh4mj8putf33htu/wajavitogeselajusi.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/96136268658.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/92735519324.pdfIn PDF document text
    • http://iwishop.hu/file/gasugefis.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ef6f317b04229735bb28c4463dc717e9/23981468636.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/maziwowopiw.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/13039331210.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b304f5997f9ee9358a583436554c2084/rokutep.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0d94e162d7e98a258498e0df270ee6fa/79489269445.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/64166451890.pdfIn PDF document text
    • http://bociany.sk/media/file/bukitebuwobalemekipaxaw.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3536c73a---murepazufijopotat.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/jalipezasopo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9bd0aa6e87f47679c321282b4a7791e5/nanipinefeguvixepab.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/kamanozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ef213ad---fedutolaloteja.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/degisapidaxajikurugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=give+an+example+of+connotationPDF 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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10580 bytes
SHA-256: 0d6090d9c3f1d9731c7f2c962aaefbf66de73e7cd829314f47c1d85f65699afe
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 18356 bytes
SHA-256: 96daebf238eda9939f6fcb00dc39c0db175e7bf5eee20c03338284f521edcd79
font_02_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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