Malicious PDF — malware analysis report

Static analysis result for SHA-256 614d61dd92afe0e8…

MALICIOUS

PDF

77.4 KB Created: 2021-08-29 14:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cd35685b8f037901053cbdfaf6852c7 SHA-1: 769155ddeb05e44bfae0881bd18f113ec21c0afd SHA-256: 614d61dd92afe0e8aade0d97858c3b9b8d050139bc14285a67d1e674d7eb28c9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://acryl-bg.com/userfiles/file/13336473909.pdf In PDF document text
    • https://pasarantogel2.com/contents//files/dezasisikamadirado.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/toxexefufanogakiso.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ceb56b5c1---45414272003.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba6d776d4---99495433474.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afaf786cad---misalazitenetomi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2df057d899fe7ad11a1d18bc17858cfc/32771199654.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/bewufevodoburam.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sceq0v95pnfup7v8e9rvv3jgpr/69705173861.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/22851367825.pdfIn PDF document text
    • http://gardatrans.com/content/Files/41927241682.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/doguvukoj.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8a534576fdd8d78b4873a4966ac1add0/felozanilafoviriruk.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/15509031741.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zawomudisalufakab.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/17444950129.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/84245347201.pdfIn PDF document text
    • https://polytex.de/sites/default/files/pofumasogizad.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5efe9b741c01c18d00614bc3bb34ee0d/nokedezikagagate.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/dororuwepumo.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zuvativenijilibelofimof.pdfIn PDF document text
    • http://solac.nl/app/webroot/files/userfiles/files/35768287295.pdfIn PDF document text
    • https://ikima.fr/uploads/file/nosaselofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chemistry+phase+change+worksheet+answersPDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 11096 bytes
SHA-256: 50a8bc666945316dafeea83ef8d33d76cd2ce68535cd742b69a6d527c3d22647
font_02_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 17164 bytes
SHA-256: 9e893c1dd9eb2b01f3c38273be49dfa6dce5a43a0ecca7147be7146957274dd5

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