Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a6ac8c2a87cf6f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-20 06:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05dfb2fb8388923f217dad6399b32946 SHA-1: 6ebd2ffccf67f9561c0d418dd8e5a50c26a7cf2f SHA-256: e1a6ac8c2a87cf6f0fb41fbaefd7cc3918f91c51d851895b2b593e24668bd979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ecohost.ru/pics/images/file/fidobikuwugawo.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1e0cbf353dfb62439bc15f3019ea34e/zanuwewinukanevikisu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4d11386fff77cfdb1e9f9da59113f920/79871995046.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda35c29c6---miwusikegelarobamimugaz.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/kuwubowemanetebije.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/c7e0b0a47e1caf925eb5e5eea2457f5b/99910367824.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46bbde97e5---67804649646.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/zezivizak.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060702383073499.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeacfb7e1b3---pejixis.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf78454fa03---4732982508.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/3733475013.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqpnmidpfrg855rr9jtc45tq1d/xumatovab.pdfIn PDF document text
    • http://belovosushi.ru/files/suvapenamutokaxuwivizaw.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/nesizebelinelubosalapozin.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/31611599448.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/worerakoti.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/37527fc58c2f940175d4f9390a33307b/setazejixonisukulup.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417db1c8f8---wabikozixikovoranuso.pdfIn PDF document text
    • http://rayanchem.com/d/files/48432638086.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/79046769631.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3439b3788714b9edcaf813dde72ae32e/85734558843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=30+eur+to+usdPDF 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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10132 bytes
SHA-256: 228ca12e77b4689d3098a9ec771df3b97e5b9a1c64c8701c61ff73cf3abc4ce2
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 17872 bytes
SHA-256: f70feab93e53d8e7decd4c60e8cc5abdb15a77a991227e427d85f0db55bebf34
font_02_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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