Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aef29de53ecb802…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 05:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edf3f357f0a1c639ade31e69d75329b1 SHA-1: 0aebd6cee6de926cdc9815dc3828bee12178d82d SHA-256: 7aef29de53ecb802d1c5783c69d220fef8acf90f532d14051b5f68ad45f9ff4b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab7a0e451---luxalibosipuzide.pdf, are likely part of this malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://yetisirkaucuk.com/firma/files/67902126166.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7d02e4ee---85102413986.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab7a0e451---luxalibosipuzide.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/simalekuzezejixilotosew.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56714188240.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/bisasen.pdfIn PDF document text
    • https://blugarden.eu/file/wufivexe.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ddce08ea5a49a148508f96dfb06d28df/14038726187.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xaxun.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630983827.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/banubexexinuvol.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wejeveruzuza.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/12177477268.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/42335449547.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/funekesoganosulafazen.pdfIn PDF document text
    • https://edarky.net/data/file/rozazomudosojifazi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mosojokurun.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a63a1243d---rubonemananatonobak.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/19150865731.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377114055b3---zulugamizigidel.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sutukoluzinanixotew.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/rafufugonakuwularidizipev.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395426d6e72---velorawajunokobekepugiz.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/94566133533.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/xurel.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/76901841649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=police+stunt+carsPDF 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_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 10324 bytes
SHA-256: 48a067500ebe3d43e0d55c7417d6ecdcc80d51d79faf8222bac2fd7050f38660
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 17172 bytes
SHA-256: f60784d36897a2744f7e6dbfe5e607c2a9a7ce03e67e0f9a86818e69efecd4cd
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1