Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd664e99ebeee12…

MALICIOUS

PDF

89.4 KB Created: 2021-07-20 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 990f3030095bab44c04f0cec5a988b27 SHA-1: 5d86c997e39d4901875b2363235f8002133d5da3 SHA-256: 8dd664e99ebeee1277ee4bd27482bbf6cbce8e868432f7e4524d7f87877e570b
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially untrusted hosting. The primary goal appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://thegioidahoacuong.com/uploads/image/files/perirekovasewopuvis.pdf In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8ef21910e2eba12b9b99770f6c05727e/mewuxufaximodipos.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/64085283269.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834dc646217---52527987697.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/033331de2e96ac1f1021cf9c8c197c9a/15146918412.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/66721449605.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/53954280106.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/43164128463.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/2cfff0551ed2d03e4e93eb2660ddd422/xiluzurixaxaxajunizawijid.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/71780b2a0eed62f3154b497bd25e43a3/92477459831.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/zuxomisudukijero.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xeruwageposugekene.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e6nap7gjgbsf49mvrdsb0a3ru4/bagazolevi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/xisame.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/93e545013cd2468cddcf27f3c227ce71/60630470053.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/56067265494.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a52895c4a---josebavum.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414defb45---mubag.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/6604449210.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/5203709094.pdfIn PDF document text
    • https://yellowstonewildlife.com/rupujamuzuru.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/vulinofesokojowarosunox.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608426c186c6c---garinari.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/dadaluki.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/05166e29e1e56bf65524cc77dc27edf7/putofunosasorason.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84840890867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+does+the+mitochondria+produce+energy+for+the+cell+worksheetPDF 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_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 16920 bytes
SHA-256: 3b8b57ecf4c3d14db91fd06354bc858a4a79f907ce9a80c6b708f0b56ba9dba8
font_01_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE3 11448 bytes
SHA-256: c5a3f44c0b79f7fd26522d4c5381c587e6d66c79655ae61ec4bcf14e99d826b0

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