Malicious PDF — malware analysis report

Static analysis result for SHA-256 38be31ca102e8bba…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 15:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b27c64a45a82a0b89be15d48cf06b58b SHA-1: eb8bfe68111c12cdc0510c4bf12701574673f5e2 SHA-256: 38be31ca102e8bba054575c3d6350e06c09a66633161d07342a68e1480f6e816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a tactic of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=atomic+radius+iodine PDF link annotation
    • http://ustunongel.com/image/files/21388061625.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/34a739dce16bcd801d847a0c05ff3432/69553255524.pdfIn PDF document text
    • http://innotack.com/userfiles/file/37420688487.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/70335271229.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/juvowejad.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec7db6e8d---29454821435.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/rukap.pdfIn PDF document text
    • http://orderkai.com/uploads/files/25211277348.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b5511f40---pobowixovopavi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613683a02541e---nasevavutelipuxesi.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/87751568668.pdfIn PDF document text
    • http://thietbinuoitom.vn/uploads/userfiles/file/90242416330.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/31411605906.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/kokiratekinaj.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/xivepuxugajewijijomilibub.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a300b5e461---lusanuwor.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0300ba7845e0fb7f5919d43aee661bb2/41518791571.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/8184908429.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_212106.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/59313815184.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/kanozabez.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/gapexokizifiwu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145a7fc6689f---72264814849.pdfIn PDF document text
    • 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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 10564 bytes
SHA-256: 3ffaa176fa0732ee2a980927b58d8e510ae6712f89091641c493a22810eed9a1
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 15336 bytes
SHA-256: 92f164d68b48b17ce943cd6ee5cb06f6d12098850e14be2b1be1d7cd99060738

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