Malicious PDF — malware analysis report

Static analysis result for SHA-256 226e3b46a676b28b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 04:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a1868e47a95678dcf941b325d5fc173 SHA-1: 2bb3d0629faf3bf874770a37760a54f6af8cd6d5 SHA-256: 226e3b46a676b28b99dcb0aeefcda280da8bef63bafdc8c0751c530a4a36e756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d68a1a783c9---nerixizikigetufo.pdf In PDF document text
    • http://atletika-pardubice.cz/files/file/zanozuzapugisipul.pdfIn PDF document text
    • http://czyxchem.com/upload/files/4207555250.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfac295151---direzofemigugej.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607833032cb6d---25418576174.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xovix.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77360638759.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210813010059.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/sujugubirenofotiji.pdfIn PDF document text
    • http://zerosquareonline.com/file/10794383601.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bfb80d7b---gevadirafovela.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607acab859dce---lijupixeka.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/83jm5i54ajnd88n8hn8sv70uf6/66499936402.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d76a67c5cc4---sekiwugugusogugajuf.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/jamib.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/dunutaradutowisar.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/46679821841.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/18/85762911083.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/savpqi9dla0tnll4uo90d32ss8/8223973786.pdfIn PDF document text
    • http://sdes.in/uploads/gagiza.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/bd86f8798698774f351311c24cf28eee/93580037894.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/gipelumelitanarogaximozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ikea+malm+queen+bed+frame+manualPDF 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_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 17472 bytes
SHA-256: 710e87b1c680674a26251c33b2ef1c607d906b40872fce2489c65b46c12dff7a
font_01_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10464 bytes
SHA-256: 7eca1738695a6a056a21e91fbb54f2d1d1866dae41637e01cd0b2bc06f7ca90d
font_02_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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