Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a16c6411e713c4…

MALICIOUS

PDF

130.1 KB Created: 2021-07-02 19:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8a8b5df4ca88f7ec0bbc0f185826af78 SHA-1: 056ba85db4cedea6408861f7b7b72c6c77b26ab7 SHA-256: 80a16c6411e713c4443ede3f148e50586719eaab9375338cc8e2a182d5e1a289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://paliukenas.lt/i/File/45897483218.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a3540943d17043cbd0433cc8073b412c/migutomowaxoge.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7bf431d1---80502351425.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/585d58ce981f323bfd869fe01d9bf37a/30062345223.pdfIn PDF document text
    • http://amandamaitland.com/images/file/20799622916.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/wotesase.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86cdcff61---duvogavejiwowikuv.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/fajoxozu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/407e029fa99234af0da6585f78779195/5067306264.pdfIn PDF document text
    • http://elskenecologie.nl/files/xebimakevesiwa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d91d861c---34542836097.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6f58c94---13667956937.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/aa58cdc547823b2360e1b32846414f2b/bonisuwoxubasapivironobe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b8fca43e---26154196245.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3af02abb64fd13f2cab02f1d2dbc028d/mosopematefes.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/mitewefuwevodareritepabo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa8244675---67866683584.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849b18905ba---51594441002.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf652e4f1---4535631259.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad766cc61---31619184054.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/fakoso.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f38d9196d6d8a9111b9156ca6d0a4f0/94301870421.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/98914fb1d1d8fef72b1f154bc3ba2dc8/nopobirig.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a510e016f9e---ruzoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=elementary+surveying+3rd+edition+by+juny+pilapil+la+putt+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a50e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A50E 22252 bytes
SHA-256: c6da50255a2867bda7e9e60bd563ec378e369d5856dbbba55bf0b2e07d20f0d1
font_00_sfnt_off000174f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F8 11544 bytes
SHA-256: c075eb6a0e535cc0bd6bdf3fb84b01146fa3965baa9fd3cf5dc7f65c52cdc637
font_01_sfnt_off00018fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE6 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off0001e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1