Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca9283905210790…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 21:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c56d6fceb849c80c98b67cfe593530b0 SHA-1: 55f1cd021faa9a69a5487be6ce4a77871c562c1f SHA-256: 9ca9283905210790ef72f1717d224f28bcc37f35efc6849677e6bc24f8ebf23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=functions+of+unctad+pdf PDF link annotation
    • https://dichocungtoi.com/userfiles/file/tokorowuvaderigovovib.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/84408398568.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ip7i1uusdrk114l2p9jf5m6bvq/luxusiwofajumodirabuf.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kiwutagirovotelewat.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/fituku.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/sujopalulolonibudimas.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/76256208945.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/8136207022.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630106607.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/jegete.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/juwigogezofewibag.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc111a8a2e---somaf.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/32658747355.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b60134b47fdd94c624d1b99275982b6e/fafakub.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/kinagebura.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/63887834119.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/60915097498.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085738bb70b7---29626603854.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb86a048d---xixarukudulebabup.pdfIn PDF document text
    • https://ksuskalology.com/images/file/fesokaribi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4b101f02---54935781192.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/67tev6n53q2ud6u5g6fqe8kn7s/nozexaxut.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/412h0cc1bh7pifba19inql5upu/sutuwaguledopekumuladera.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/87526261048.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/37085027055.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 10412 bytes
SHA-256: c41c39dd7209b9525e7f686153e8433529def7cd585ae0148e5c0819ba1b459a
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16800 bytes
SHA-256: 75904337c29e07e96d355ac55b31bd94e350b608837ecf72717fdb6ac7dbe575
font_02_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1