Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca586cc2607fcffe…

MALICIOUS

PDF

72.3 KB Created: 2021-08-11 13:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bfd4e45dfcdb042ca3ab364b3af282e SHA-1: af6377c3c4e6b24a69c264f720fc8cab10005258 SHA-256: ca586cc2607fcffe0fbe9eb525be81e170b472adca34650244e6e24c414c25ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://wagnerfamilyreunion.com/clients/866685/File/belisoxipu.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8d044e30e1c70ba64ed08171646fba2e/semilidufusexijevaber.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/75428931344.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/408161d60aa8fcd2d703ac2ff29e8015/69762055901.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/fefatijunaxo.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/67971395675.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1op2uhjmq5605jlsel62mie6c/46962091304.pdfIn PDF document text
    • http://hrudolf.com/userfiles/17058602721.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xuginofabiru.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b956c48ffe7---tavogisowakikuxiledan.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdaca90e7---96948760343.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/34724748577.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/xebukuxaditosezebuze.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jafasajibilejujepoduna.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16251724011323284686.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865a2952ef3---movemit.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nanaluretowepewiviluvage.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa997ea5cff---voxem.pdfIn PDF document text
    • http://guitarenko.fr/img/files/58043684554.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/tuvixetilozunajususilifi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/acf468d8f70cea302d4228b89f768bc7/lafegojizol.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210714101501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kiwi+crate+treasure+huntPDF 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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 16308 bytes
SHA-256: 075b740c923487c4301cf906f96b91f3791a8d225d32593fd10efa4482e084b4
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 10340 bytes
SHA-256: ab855a540903de94bcba1dd8d9d7c3a70167e88d62f0bde3c0a3e6a545dacd18

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