Malicious PDF — malware analysis report

Static analysis result for SHA-256 16012324257a76cd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-27 23:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01a397ebaa1d5fa08df0e95ef40baf2e SHA-1: 74d8677b32fcbf975e6cb62772fa52bf27efc7fd SHA-256: 16012324257a76cdd09b53c086d7b3fef53edac57dca528459326f2fa958d8f0
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. Static analysis revealed multiple heuristics indicating it functions as a link farm, directing users to various external websites hosted on disposable domains or compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://pixomot.ru/uplcv?utm_term=attivazione+debug+usb+android PDF link annotation
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85821156319.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/37462431246.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/25688d4949d3bea22fff4ce29a2d8d47/beladikirizubalogod.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noparur.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63469948990.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33592800448.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kafarekotopa.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vabazowejibavaga.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/65213630158.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/63602985487.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fa0d8abfb0fc9e2f1d1749707f0f2cfb/43748731812.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/77872633506.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/soruzujewap.pdfIn PDF document text
    • http://esteel.my/userfiles/file/14144300425.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/nozawe.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/2506343908.pdfIn PDF document text
    • http://xhzhengli.com/upload/kuzigukimubelinulo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202194164772512.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/54674426013.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/liwawumagajemekiwevu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/19535200273.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/fivur.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/litanegone.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/sozutezasewujamopulegup.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/s2baogq88ugns50ienagoafg5j/balemadaxu.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/80000047402.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_off0000bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 17736 bytes
SHA-256: e942c967fd752f5b1393855a7fbc9aa5250b3feaf2ff0035a627204dd5401e1b
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 10724 bytes
SHA-256: 37200708c768d66daa0d7a6defc4f9006763cfe2b0b9ea3a89b3ed017d1abc3b
font_02_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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