Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac26c86f90919b9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 11:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 682d69678d6e60b9efad8fda73f770dc SHA-1: b7a3a58c909c2d5f1d2c215886bbd53c1a338df1 SHA-256: bac26c86f90919b9a7763d8304b0151741fe810db37712b100f25a852e32e28c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=dls+2019+free+coins PDF link annotation
    • http://aven.su/userfiles/file/57327868205.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210907080835175700a8cex5.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/nenigituboluwipajinukezuw.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61148d58---52979258263.pdfIn PDF document text
    • http://wsm.hk/images/files/gatoxotinufuxuj.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/lesopejalivarel.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/69769530067.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/pumofugebul.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/zutidoxakekunat.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202193_145811_456.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/51172886454.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133884ae8dac---26619703994.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/56153246715.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/punuleraw.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902121822183407.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133379a0cbf7---vazavemulavatezoboxokolo.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vijinirevojagotaj.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/gosajuweto.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/51941247168.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3afa1d6b62dcf65e988850650752ee29/51504352471.pdfIn PDF document text
    • http://specialcats.nl/media/files/64988561672.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/fudazanajip.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0492644001631724295.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/18184964081.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_off0000b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 16996 bytes
SHA-256: 6aa4a7fdaa47718e42265916c41a43130dd8d121b26dc0842ef3a9dfdffc2985
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 10532 bytes
SHA-256: 5c013ea212cee617ad91e522cb94a1828eb87488f1bddfb3c6d0aa6af55d1250

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