Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a2b6165c8d276e…

MALICIOUS

PDF

166.2 KB Created: 2021-06-23 23:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: af8defa9fc6b98bdecacd57bc23957f3 SHA-1: 5f36952b13900ad844bb9db6c57f4d9c3a0c17c6 SHA-256: 76a2b6165c8d276ef83642a2441f7a9d54ceddccfd6ab3f4c39f093ab323d073
156 Risk Score

Malware Insights

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

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 0.9978

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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fb21ad98---48013695744.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fadbeab4f4fa847b5d69f70834b0a978/ridogegisogujuvopadok.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f15ac5c6e---16159078828.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/365df66e552d93ea0b7a6404035c5770/49466343766.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24a7aaf0e---82774981499.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/4suqup122negt8ske8dudelel6/vuvesuxop.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665c704e61---dotolopatitopaxe.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/zizejugorimadavodofa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ba6f9af4dd9e42b90db48bf1b586f43f/vuxekamazubokuvudewise.pdfIn PDF document text
    • https://renault-service.com/userfiles/26735825687.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/54009606002.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/563e11cc7cf9433fb98e2ab3d427610e/fokupilibabopi.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/65341625751.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d015b571dca6ce92b3e6d7923bd9144a/gikudajabubufimumokegipe.pdfIn PDF document text
    • http://{IPreporter}:8686/api/v5/report/{dashboardUID}?apitoken={tokenidIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=grafana+reporter+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://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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 108716 bytes
SHA-256: 64a4ceb598970f2dcedf27c529ec97a91be9e3b9567bff4528096a0292aae47d
font_01_sfnt_off00022cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CB6 4596 bytes
SHA-256: ee2cc4e5489e93e05a6447b57c1a1509149d66f00024e1e4bfa54643162d612a
font_02_sfnt_off00023c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C59 12592 bytes
SHA-256: beac1e22957284bac02000eb1eb2ce50bfb1432f324f3466ee6e9c55d70e998a
font_03_sfnt_off00026774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26774 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_04_sfnt_off00027ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CA2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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