Malicious PDF — malware analysis report

Static analysis result for SHA-256 c171aab896d4e723…

MALICIOUS

PDF

80.6 KB Created: 2021-10-06 13:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59e4370de7fbf0fc78491120170b2dee SHA-1: 862a39b231ec4b0562e3e09d1e27857e3e255f44 SHA-256: c171aab896d4e723f0e432ba8f539c02edcca8996c665e04b7ece2e70f81ba10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=absolute+and+percent+relative+uncertainty PDF link annotation
    • http://anm-av.de/uploads/files/mebat.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/tudaled.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/kewefamez.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/masisejaga.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145e3d9000db---24356908507.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/ludimedenaviku.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/28816188614.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/letizizinuba.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/91363959639.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vizuziteset.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/50453563609.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/mixesojatodu.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/ferugufuzegami.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/99438951952.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/2600548381.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7a52910c---64014452754.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/50139347804.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/gonevifej.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xezagi.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/80220427799.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/81597400761.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/85205410613.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/sowubumabufolufogufa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c59cbd67b---95031672485.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/motabagizupot.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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10908 bytes
SHA-256: 52ae0cb0ef56031701a115bb327f5c1938960f4a2ffea9f27d48b7a63c88e68f
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 17804 bytes
SHA-256: 176434dbad7a230009a7ee6c2b35b010729e5ba4ad5d22ea76c7174a5f1f21b5
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.