Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c48c24983eff20f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 10:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 517a3e92dc3c477e5da64a4d9174480b SHA-1: a7f2bc6b46f070c99817a6a54b372f10f49bcac1 SHA-256: 8c48c24983eff20ffa8a51143960dbcf819ae99b1253acee0f12c96fd41ede64
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://7m-shop.com/userfiles/file/28362312280.pdf In PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/33694656266.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/rusegotude.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414fde59220---vudoputusavowudeguwag.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/tigepujana.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/29190400722.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/3940604453.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/pirudovuvosiwawujeme.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/jisogixonipuveruxenu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f895a7ebf---kuvavuvigofizi.pdfIn PDF document text
    • http://tid.vn/upload/files/20305942211.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/77602807511.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zumobopopejefatubi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/newuk.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5ac286d1d---bajifimonixapewa.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/barupojemesavuwitime.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109161806364733.pdfIn PDF document text
    • http://espokebar.com/uploads/files/34102254158.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/nuwisigasaj.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/57478163177.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/kurorepoxez.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/xabuxukofumuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=one+piece+bounty+rush+new+characterPDF 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_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 10892 bytes
SHA-256: b1cf8e06f86474f9573a828991065bee69ce01c04bed3e7d3b28c35be4292619
font_02_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 16644 bytes
SHA-256: 81a87a36649c61c8e267bf122a5951d4d11ee7c4bce97e24d5c3e979a32c37ba