Malicious PDF — malware analysis report

Static analysis result for SHA-256 604443b76873dc55…

MALICIOUS

PDF

74.9 KB Created: 2021-06-28 04:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cd3690af51ce1f487bd06ace205bbf6 SHA-1: d887bceae5f4eba7c1a29a21992cdfaf3581d9c9 SHA-256: 604443b76873dc558d2bffbaf99a1bb101d9d09e3819f44fa754c4f823d4f47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to direct users to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20bb6e54e6---wumegutudibupu.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uibd1qo23ro87gn66t1ibpnnaj/pigaveduw.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/90170244171.pdfIn PDF document text
    • http://sam-global.info/files/file/18802521639.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/77846749759.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d954e137cc---76556997073.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/zozipetesusiruso.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lu1sdn7a3ak30m6o0i9bsac1g5/vedolumegotaxitu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cef0d6e3e6b9159b8e5762314ca8dc09/xanen.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210610_093523.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///98002315976.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5fe4e94e---7545932452.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/479ecd68462d612f74a427fab3c0e397/vefuranaxakarelekulo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079302e28519---91691035166.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7365ca70a---3494536109.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877040a6c---gufesiberus.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e2d3d42eefb74befb6a802217319e94a/58141632356.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/tipotunozapopunasa.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/wovexefu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd82941a56---jupojamuguparixelexo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04d6123c0---vadowop.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pj9bgj6gqs7v5sol9c6i65d33v/xilurinopixazoxi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1896ee5de---dakepupevu.pdfIn PDF document text
    • http://phunhai.net/upload/files/90983846200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reprimand+legal+meaningPDF 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_off0000c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 17764 bytes
SHA-256: 0f440f87fbc0b68317d95fa9fa4de79c020fb3bbcb3232683d7a751c710edae2
font_02_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10392 bytes
SHA-256: f809feab4b9bdc6fc668b656f4f10032971306a5ea33a6e60d985145528825ca

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