Malicious PDF — malware analysis report

Static analysis result for SHA-256 9893d33abc83f66b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-14 02:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f7a3cc461a6527cf1e9d24bdab8a2a2 SHA-1: e5f994dcb9b5c730f96e37276ff7b2e0a2a006f8 SHA-256: 9893d33abc83f66b83f21aa56f8ef7ab83eec4e81cdb114bc03c0eda41a26d1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160926a3f34a26---36456728920.pdf In PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/59345663150.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/janidukenemolipusigojon.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8nn6pe8epkbjql3gcpeugjh5cl/27885439777.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1226a04e---54892860986.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/53774007387c830d23e04f6c7bc4c525/71760790941.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3cr9v1uqdidglm58jsbeim82g2/woderumasada.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2708d2c7---90599010596.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe555c8537---3170091510.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef17bd8b1---95694291794.pdfIn PDF document text
    • http://fkhd.cz/data/img/mewimenukolidusifesalim.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/milolibef.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20086577937.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/nupalefotawolezaki.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/30561036550.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/68881583477.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/44372874782.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088dad29a360---25243728351.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/xekuxon.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb47e575df---56262377966.pdfIn PDF document text
    • https://onelineservice.it/file/43625397829.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/limalezalafem.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/70679765313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=push+pull+workout+4+days+a+weekPDF 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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 17412 bytes
SHA-256: cb0125495beda06f73d3133dd2f306dba873698a01763207ccd045476a3047e0
font_02_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 10764 bytes
SHA-256: fce3555cc113c5c7c3501076fd633016cf7c01fe23a91bb14e436eb96ecc7c91

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