Malicious PDF — malware analysis report

Static analysis result for SHA-256 984bb30182669ebc…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 09:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b436b8998bad12d177e7f0ff98adfd21 SHA-1: f7cd820197b671b1c65eb458c6c5824dae4444ec SHA-256: 984bb30182669ebc54758116f123986c188aa5a16f75a187b0e401fe7f323d6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, suggesting a phishing or redirection scheme. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality, potentially for further payload delivery or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35077649744.pdf In PDF document text
    • http://radtel-sport.pl/userfiles/file/73909511504.pdfIn PDF document text
    • http://juncheng.tw/upload/files/nudolegepalepatud.pdfIn PDF document text
    • http://machulski.com/public/file/moperunogigige.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dezixevaxevadutupi.pdfIn PDF document text
    • http://parilka.by/var/upload/file/lagewuz.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/jisakagov.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fawazisi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/36800182487.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/373719902.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/95772872646.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143ebfc1560f---sijaxud.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376b6446556---8214168883.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/letevedenuwaxew.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/4245659568.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/38056758478.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/reloduxeju.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210904085849.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/lelakofikumanosemetulidam.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/mufabinubiloxifaxurex.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/90714850301.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bereto.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141180b57b---90352018730.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/9208974445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dua+for+my+father+healthPDF 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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 10332 bytes
SHA-256: cf7be98d083aada4231ebbfca6f80d19dc8f88624eb1a7388785b0f22e81b85c
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 23276 bytes
SHA-256: 0e0d52c51d04f6ee1b660bf00e61c1ab80d02bfe36050b05cfdc05ee5259f2b4

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