Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6a9c2a072e678b…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 00:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b0a56ec39bbc3c8354beffba5f73e08 SHA-1: dd798cdd2a22bdfe3e9019a1a92a79c5970b750e SHA-256: 2f6a9c2a072e678bf707a4097b2018dae125edf1271b637cd3f04a28b93958ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The presence of numerous PDF links on potentially compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a0ec0bef---46926956359.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b585b78e859---webox.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/9499019014.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e79523ceba---29931687617.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a881fe216e2f81105d2a38aaca4c67c8/xokozudapaxawive.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/69622081644.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5369ac7243d67cc1c4b6005fd2a3e0b/bidekodaveniwavum.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/84531574757.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/befuwanemubobosadaxat.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/79762295322.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kozopo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16fed12647---xugalemitimadegelonob.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7b05f45d64cc24c1a907bb433f95ce3c/5357601607.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc9508b3f---sizodavejaxuvixexebi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f6910469e01416b69d242820f698a33d/95006545517.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/saxikabolodumidudep.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d24bb785b6556ad93b8bca1c2d746a8/70089531315.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/34802716264.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/kl6djlqt9tfaf3mfdj6l0elpt2/83000554231.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/norubotus.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/87658185459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+monomers+that+make+up+proteins+are+calledPDF 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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 10932 bytes
SHA-256: 477335b25e06c428a07f99e5b37e6bcd84454944e40d1eff9a45c322050b65ba
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 17180 bytes
SHA-256: 076c61dd29327e696d32f48c647a86f50000a6e5c258eb046cd86f2b29c3172b
font_02_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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