Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4237626de23d4a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 18:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc7a0a2f84dd5656c986c1f63b3d0279 SHA-1: 3c50c4234b88bd94173a0949d9a19928639dbfd4 SHA-256: 2c4237626de23d4ae1025ff98321baa8168492bece8d11daa6851ab4d7961d3e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://micsys.in/userfiles/file/ripofeliparixosizasipunu.pdf In PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/67445396587.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/vozeguzivanovo.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/89749459232.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/devawij.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/rulovovizilazenat.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tipopafenejade.pdfIn PDF document text
    • http://villamishkan.com/310renonew/front/images/files/ketokip.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/vupirurafudu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/66370494962.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45e26a925---mugibaxipazisetawiburep.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/nofir.pdfIn PDF document text
    • https://nasikampung.info/contents/files/29557846310.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109070334241474.pdfIn PDF document text
    • http://slsnn.ru/content/file/38166775524.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/fobevu.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910155714.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d264da03---4934161209.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5a040bcf8265a4bb3af8712f50d685b1/21554485178.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/jevitozorimukuso.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/52605971049.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109130450465131.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/74580788222.pdfIn PDF document text
    • http://sbairs.com/datas/files/gijajewatixitule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+paid+vpn+mod+apkPDF 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_off0000be6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 10616 bytes
SHA-256: da6b751cc2c85d56c45d81a2ee8f2b4433fe54d76c9a7a8cad8201d16afa3122
font_02_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 17332 bytes
SHA-256: d425d805c2e55f9b456125014d81f43697e9d8a06192a95ac0d9dac43251c29b