Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86bc6dbc99f8888…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 05:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcbb405f4a7aebc44e9962eca24359e0 SHA-1: 7754a69bc2e76653f1ae362dbebe96fd124c5dc1 SHA-256: d86bc6dbc99f8888473ee59fd93288dfa6d20e61ae4c4dc4ce32dfa6721150a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL indicates a potential phishing or tracking lure.

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://ketchas.ru/uplcv?utm_term=android+wifi+tool PDF link annotation
    • http://hyundaiokla.com/uploads/files/fokosepojegiluxasisa.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/91943589782.pdfIn PDF document text
    • http://watch62.ru/files/files/bulemaxonirez.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/milom.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaed410973---rabus.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zenezisofijal.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/27792315491.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347796abc5e---13100410670.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/xezuzidob.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210906204714827.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a63fa8427c---zefarovipaz.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/89619043130.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/wanif.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/10078650520.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/jujijuxisi.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/fawudasopadasololenefebe.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/xenikilagabujupilagogi.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/wozemij.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/muguluje.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sobimazuluwerawakan.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161340d5446b52---muruzas.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/vexidinopavarejoni.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/naroridi.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zuxerorujivedevekak.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vemegavelovenixudibodu.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_off0000b600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 15304 bytes
SHA-256: bf693256a358e7bedd81a9057ececbad47f68936f6e863f60b21fa383c55e02f
font_02_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 9952 bytes
SHA-256: a58435d9278eaa86d8a5fc81f4c7a0e429e9e3c1d07d64bca9b8a29fbbec5368

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