Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b04889455b10ff…

MALICIOUS

PDF

83.8 KB Created: 2021-07-08 02:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e281aa0bf1efe523bfdf1450c42c3849 SHA-1: 6aa5e997907e3f8e60c9dc6539d77072fdbfa649 SHA-256: 34b04889455b10ff69b48dfc493a50d05c321984c1546591adaa7703e090c019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary goal appears to be redirecting users through these links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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 https://empezo.xyz/js/ckfinder/userfiles/files/27320168203.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9da2c00c---fofagukejutamigogesara.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b4ce5290---vaxokefukenira.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rupale.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/52034705135.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f73c047b6a16913f956dbb499da9f12e/dawonuzegemuwapepoka.pdfIn PDF document text
    • https://wonkingchina.com/d/files/95325974654.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/4burlmqt6hmasci20mdtssord7/63358301827.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/95jggto27hj8ulndlsv7lumbq4/tolav.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8c552cdbe27bd207ae2c5016c8568a3/rumat.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/25d866770d899d8c007fcff649ad69ea/98878891500.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/26206136080.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/3714300444.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/saxoretesibobutozifo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8132bbafd81f2debba9bbca7fc425cbd/lenesesaxumejiveteto.pdfIn PDF document text
    • http://heureka-cz.eu/files/58591001861.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ab6a1cb5440e76245ade7e4dbf8c656c/32287453959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=spies+during+the+american+revolutionPDF 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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16736 bytes
SHA-256: b7aaaacf7296a3a8e947ef96b2afd5dd59348cf88f0ffc3c3331538009b8e285
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 11204 bytes
SHA-256: bb64e1cbde14752b3bdeac8de36f9b7437e41e79f8b77b8d26f7ae326dfa7751
font_02_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1