Malicious PDF — malware analysis report

Static analysis result for SHA-256 91109f99e2c273fe…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 17:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07c663cce02355b469170c7be6fbba56 SHA-1: 813f55326794fff2ec1f7571f27acef25400dfd7 SHA-256: 91109f99e2c273fefb0bf6cc14d0728695075851e5ff2c22061d5e133f48bc3b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tiwiwafeguva.pdf In PDF document text
    • https://digireg.ru/upload/20835067224.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/libovixamaxo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ffbf17d13f6241bb0b265f13f9aad522/pekigalidubo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/53430120177.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nibedelasetakulofomuxixam.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/pekonetixufe.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/42739276180.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/79a2a44ad5a5647b65a3004355a9e685/lelovetiwasopip.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b22ni999h844rvskiup2n24v1/18253308053.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ce5oaete34v1acg1hmrlfit83f/gobanojujufeboked.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/givuzomusedufiwofofefusu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/617b423426379c320f1dd8385bc4e248/51623098303.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/tudivan.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/69546799077.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e83d02fb6---notukonobinujive.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e188de74718---molulurez.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/18444202031.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/wusubavimesat.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/tapuzemuwajixawegodubule.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/bigigaledovefobakon.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/81075404443.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/55829837419.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/61572198707.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/vusofemabekite.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/67574802704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=stansted+airport+duty+freePDF 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_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 16008 bytes
SHA-256: 74848d1eb4f38756db84b704123c01bb9ba7758ecbe1e23e23a8996eed210249
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10736 bytes
SHA-256: 465194f843464c6a5403f039e5f038f293d863ca0d241de7cd0652e6f0d681d7

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