Malicious PDF — malware analysis report

Static analysis result for SHA-256 4961ee7338051c8c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 00:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a221166c0bc18b006417c96a637502ee SHA-1: 233bcef658a368c0dc860924dc88ec3e62115e8f SHA-256: 4961ee7338051c8c37fdc986ad03e440f8c393e59a7c5f572ed39a64190b30ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=density+of+metals+g%2Fcm3+pdf
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/66572195424.pdf
    • http://tinhdauvietnam.vn/upload/files/49848729431.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5b6f05ea7c736eecb0e5e8522b74cf62/67240552935.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/79337479261.pdf
    • https://zhongzing.com/uploads/files/202108161638255340.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7b96e5eaa---66475055616.pdf
    • http://186086.com/upload/files/jegijisojamer.pdf
    • http://oresteruggiero.com/userfiles/files/28227649220.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gnkn5u4nc2gc19j0oqk64nbskr/88108201655.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bed3ca5209f2c4aa42f47c32ec85efb3/porobazisu.pdf
    • http://grafichesirio.com/userfiles/files/razisuwaxulurataz.pdf
    • https://ludifrance.fr/userfiles/file/44388473220.pdf
    • http://geopraxis.it/userfiles/files/98794880786.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608989f0a2ee5---48621672340.pdf
    • http://blevy.com/ckfinder/userfiles/files/74503976815.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/25815207041.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/feee77bf7090df30d1f2cf5e59292a5f/zivatogewaluwudibel.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c9c167be1db84c3624d77d0f4397461c/14752952255.pdf
    • https://deltagroup.bg/uploads/file/rukarunosibaxutixedomifap.pdf
    • https://primer-spb.ru/files/files/18020994224.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608268f679565---wiruleranebedutizone.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/xigojilufobelapar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58c.bin
37a906272ae36fc329acac82a7adfb07c72ac86566a3d275b88689947a7edf09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 18628 bytes
font_01_sfnt_off0001162f.bin
7869fe69d6c1aa08fb458a778794459fce6b1232f530dc1e88f5ac01ea58851d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 11184 bytes
font_02_sfnt_off00013054.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 16792 bytes