Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f6abccf71fd9c2…

MALICIOUS

PDF

75.8 KB Created: 2021-08-11 19:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac8874ff67dd874d446f60e3bdd584b9 SHA-1: 2fc2a41eb8803d95fe631b1ebb63ca98b0411186 SHA-256: f4f6abccf71fd9c2bd2f566e7d478fe3090c736b581ee6441cf67581c25870f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ce1895d8b6c5e1423214eaed36688d07/bedafexupod.pdf In PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/e448b4cb58d2b2dfc8c26f1ad4bcdb28/48841798644.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58520571872.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/mamagawixesosamabu.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/24205256257.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/nolewevutaso.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa7037e95---68014199449.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741e699f352---99552131777.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cf66ca08---56581547676.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/7816298376.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df04c312459---36654276881.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e642b2c28b0e4dd94a57ecedb77237d9/mofudotowudemoduxuperid.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/olgofgpqsvl4isfp38hchfh2un/85334145143.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/93212072755.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/18934315049.pdfIn PDF document text
    • http://edallyshop.com/upload/files/49526519577.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ths1gr8hbk1ivm4101702vl0su/xewifovopeforisotako.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ce2t67tqsphc5u5ebgfsk8vdr2/96492662292.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210530/2105300806593733633fg247e8g7s6.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160720c1f79da3---16488342222.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/dobikikijig.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/92561647104.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b17c0199f---81235514201.pdfIn PDF document text
    • http://serting.eu/userfiles/files/11213457466.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/jawanisefipamos.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/59308411923.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef1413d8f---2738066137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=10.s%C4%B1n%C4%B1f+fizik+soru+bankas%C4%B1+pdf+2018PDF 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_off0000c273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 17124 bytes
SHA-256: 44cf6ad48e461f7391a078c7af0c9ee5ed0f2afa26a8fd9d9df46990c8af19e0
font_02_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 11124 bytes
SHA-256: 91a515e4913ffc01348a50e2062d3bb1029aef0c9d4f0174f70c6dac9b68aa28

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