Malicious PDF — malware analysis report

Static analysis result for SHA-256 4504b762c6d1e4aa…

MALICIOUS

PDF

82.0 KB Created: 2021-06-23 11:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bfbce7965381e577e6ac676806408031 SHA-1: a686c71c6ae4b6e29a5d6cac38588ed2876a562e SHA-256: 4504b762c6d1e4aaec76a0c70924086f9b58fa8dfdccb9de537103e7f428379c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9504f1f3---gojozorezofenufub.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607db754967a4---fodobimitadif.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/9038776001.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46c88ce0---40442233736.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/443329sd2n04spf5o4n290p8dm/78353767124.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/razezifituwed.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609016a2c9225---94007954994.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c3f0576d---39094107481.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ae75fd4f---31003515546.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/6197569484.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a464e9f0b034cde20ef22607f40d8602/zomowifidifa.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eae903041---sibexikunevu.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6613848db1476fae0ebedec60a58dff8/vapukixogajezujavizek.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/peganujapexogir.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900764480ae---pokanexog.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/nimosibojusig.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf89v3j6ib6kfshdte7eolq10i/13061499268.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fabd72041b8fe63d88c87d4186f7d270/65766715243.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/668ee164588147536041d88fd00a7acf/25291647194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+djvu+readerPDF 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://scripts.sil.org/OFLIn 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 4828 bytes
SHA-256: c9797d6628b00f026858a188fe27cc6a1a9a48f44b8ab18a9b1411a3918a4a9b
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 11580 bytes
SHA-256: 2b5d0058f2d419d82bf35e095e49ded5cef61fe254d8a96d3d9cb4e91fd3c176
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 16252 bytes
SHA-256: 1dd8ed7c429e29945a0e928f4344e06b7e9c8952d180e38aa8427fa1860c9466

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