Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fd1c0290f71875…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 08:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ace12051e2d96e40b6e7c41c4eb04b59 SHA-1: 92e90e3bbd48401f16240ff04f938636ee3006f0 SHA-256: 99fd1c0290f718756929c4f39b2c1d6ef158a0db927cdc8a636eb3d8ba7b06f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607813244286f---vogefonosajikubopegeko.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4a2440e6990dae0da7a5ce408faf01cd/jovobafalazanek.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fc6e4546c91424b1d764741cfcb4e019/87173355461.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/b31bc77f423cc9d4d8ca5376e498724c/1242050823.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/46349082650.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/mebisuwapis.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cd1f6dc17929590414638c3aebc442b3/88240921522.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/91795100447.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c005a43f75d---11497359669.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bfbb9a0c3---jedog.pdfIn PDF document text
    • https://netlandschool.cl/files/26867907421.pdfIn PDF document text
    • http://rubensova16.cz/files/file/sojeseposif.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7bd5eb8f---77892795977.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126bb05eaeb8---govifasajunuwikasinuzuf.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0m9mv6f5dchoh7jokc8l1udikt/53065216186.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd33b403e7---josozavawuvisenisikabeken.pdfIn PDF document text
    • https://mauspro.net/upload/files/12582111610.pdfIn PDF document text
    • http://darec.sk/files/files/saset.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/42530757373.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qi8nlsjvarbfpcbjbt00cdrt2p/16176694655.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/57024136563.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/76608373424.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160714da93f7ea---18105394371.pdfIn PDF document text
    • http://licausi.it/userfiles/files/63205578778.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/volufuk.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/65761475.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c7a90061---68861464958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=transmission+impairment+pdfPDF 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_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 17348 bytes
SHA-256: 40a861781e4e7ffc475b34a68a4b2061e4a8e50eaea959631c4f10bf9009dfaf
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 10576 bytes
SHA-256: fbfa061b08c41732e284e351ac40baae0ea922f697d8af380f35f790cca700a7

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