Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08735a0c77bed0d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 19:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f827d764f095c2dcd42e18a6a6d9aed SHA-1: c9d0d5c15eb8d30cc2e4135a903d42839bf9518f SHA-256: a08735a0c77bed0d52efc8cdd9e2a8bbf73723f5585f5613212242d8531b21e3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into downloading malware or engaging in phishing activities. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://tongkhomica.com/upload/files/mefenelexuzivu.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0a6a1eeaf---dipekukosixomen.pdfIn PDF document text
    • https://olterus.org/contents/files/77765833575.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/bevazadojuxabudexalewiz.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/neliwerovoxewodekipuzo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e94016066---71951565206.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/77520351858.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/97664914816.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/gejifiti.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109162332151056.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/lifawemafewisapa.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lopikemenulumi.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/11812267160.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd07016c2d---26587290749.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18112648914.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/40671374360.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/42689001264.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/bodis.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/jidinurikir.pdfIn PDF document text
    • http://gestioniarmatoriali.it/mareleka.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021927138154154.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffbca2dcd---86322434454.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137518fc7459---dadog.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/33449725837.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54180749593.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/ziwajodavodiwisusejuzuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bloons+td+battles+mod+downloadPDF 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_off0000b6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CD 10496 bytes
SHA-256: 1dcb8298ef2e6fe547ec350f3e5b2dd1cd952f1ddc1ca29106979932f5cbced9
font_01_sfnt_off0000cec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 16760 bytes
SHA-256: 459f438a5de586e71fb3191c132087e6d5f9ba362143b4f65df0eb5a9a9cdf27
font_02_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1