Malicious PDF — malware analysis report

Static analysis result for SHA-256 843eaa94e289b184…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 04:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31e9d5714cdfb5d5dbfc12353166cded SHA-1: d115b7cc9fd9b74002a3091005958632d455f9d4 SHA-256: 843eaa94e289b184d85f11ef9fab6bd8c5846835a0992919afa44c7273be647a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=hello+neighbor+2+mobile+apk PDF link annotation
    • https://sarenpinler.com/calisma2/files/uploads/watotu.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zajekofulon.pdfIn PDF document text
    • https://norservis.cz/files/files/27709461992.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646c6508ea---99636579991.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/19183257867.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161325c8cc54a7---64034038882.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/midali.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/72923129982.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/47429430230.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/dunut.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/munusakekavinevesedizopu.pdfIn PDF document text
    • https://kvzriu.org/images/file/dudikasinudidazibufidegeg.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/ritemari.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/biduxir.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/pizob.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-4/20210904051233106897.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0pdmqjlp3v2s335h95oqsomk17/sovofijapasixikibuxidus.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/54489067562.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/neviputoz.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/15542813131.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/95520264419.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5d29fe671542d35350752a7fc1f3226e/pabegepujebowijezatedij.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/sufut.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161408b9b3116c---lugasexekomag.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/91192978680.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210909/file/19889661336.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/famaxizizox.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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 18104 bytes
SHA-256: f963f3c30e87951f321a8b5ad14bcddc9a598cba58cb72ea32f3f73297ed36a2
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 10776 bytes
SHA-256: 0ddf7acf2c56adec9a0aa624dd5a0c1e03c6947e1bd44983c8829bcf1ab08f9f

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