Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b643b890ebc2e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 21:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eeb6d045f974bb2b8b6bb15041e1cc60 SHA-1: 28e6913920a878b86cb23da0842a658a6fefb7cc SHA-256: a81b643b890ebc2e943c41e784d39c172fd4ab6e0f57a25c6bc2e36be0a81b06
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://chcial.ru/uplcv?utm_term=where+can+i+watch+my+spy PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acee8b462c---vefafamezuw.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/64885614493.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/6109488794.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/dodelenizoxesadurusego.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/wutipe.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/71176059433.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/85759399435.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/33083237482.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/52170060499.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35884832514.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6721227753.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb8cdc6fa---95021875320.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe96881bf3---pojodejativejojesejef.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109082229454803.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gijiwudefufetenid.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/91467852051.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efcc2d19e9---tibeluwafegewi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f558ab7c79---sikevajagafaramixe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e10356b9466f3778af7e22fc9962045d/49801667268.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zovuzejagavomamulowod.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/xupujimulan.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/74867521710.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137edc8cc921---33711187353.pdfIn PDF document text
    • 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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 17592 bytes
SHA-256: c052e1dd725f0a5d77dd642297f793916792d1c5cd0cc3322d4555b187a63ea7
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10668 bytes
SHA-256: ff5ce54edb9f9680e7b79f085001a9f61322c5e1ec9a5461b0d53168d393e9f2
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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