Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7d11db9a566d49…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 21:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c83b2f8cf7b5437591d1c87d4537b535 SHA-1: 5cadd45c668a5040a94ba45982120de667deaa16 SHA-256: ef7d11db9a566d493af97ae1360a18cfdf6815622b1a57405176569209e6ba73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kipass.fr/userfiles/file/80223427189.pdf In PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a95e92889358833c041b1963162d6aeb/96996040009.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/xetesa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mspcsl98f6rvqpltjptg9v1i1i/pelenawofudiz.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/12639620034.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76fa20082dd52bd2d3ad06a3f6a04960/88397143086.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f4c030d7e276499d8b872b12ef7df42d/25588218778.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/26353446310.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bilulipo.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/93373889679.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad6b05a81---7557862420.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e76d988f787---xojemunu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad398621d---rejibopaduwupiviluj.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/18946348023.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/18081132381.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/fa094b476642fa7c20e36bb2ffee3c43/jabizisexubokotutonukad.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/58128060807.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pj7slj76klmrru6utge9qj06s1/73773779422.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/luzabozag.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/xisubexipava.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zenefifusi.pdfIn PDF document text
    • http://checopharma.com/upload/files/80321004747.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/73137191039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=replaceable+head+manual+toothbrushPDF 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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10972 bytes
SHA-256: de916265b6686f2ec246504ef90dfa43a07a2d4fbbfb3c22cbfa198632350566
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 17548 bytes
SHA-256: 6dab634de1da85bdada0fc33f2c175eef4515683a6f2062be7c99248d17d7a96
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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