Malicious PDF — malware analysis report

Static analysis result for SHA-256 b050d894713e254a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 13:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e07fd72eae716361f98e3838fb7c7ab6 SHA-1: edbe7833ac48f42487b071e8eacf27492bd4ce38 SHA-256: b050d894713e254a5742ea8644643cc6e94660adfff4a52c83e9b3d829c35f7e
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or SEO manipulation. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/fiximajesumulilodakur.pdf In PDF document text
    • https://newtop-eg.com/userfiles/file/bujosojorivonejixi.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/40394935372.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8fc21f003---7680768995.pdfIn PDF document text
    • http://kids-ex.com/71490175778.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/xexejalumotijenexo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/88189257587.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/bavevu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/bd7209f06d7490c1547d8651ea82113c/80405432207.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/bufisozumaxajesi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4241bb8---69960693748.pdfIn PDF document text
    • http://climtech.com/files/files/pisini.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pupotifomifokukide.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/67863838957.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/31330126289.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/12379038308.pdfIn PDF document text
    • http://garderoba.sk/images/_file/lamifefivikukafeta.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385fa76352---firidujasinakag.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nisseljbvir9pa8nidppvd9tfm/maderunedamixafasobisi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/n5t8in1cd0s8sq1v6qdd4hh904/temudupumeboduze.pdfIn PDF document text
    • http://erpos.sk/data/files/mubivazanifozob.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/gukazibow.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/32751974237.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210822_A2881A15008FF38D.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/588d286c5607874fcc5d6fdb77aea41c/48355147944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=heating+curve+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_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 17948 bytes
SHA-256: 74c51bbffe30cb61ec00ee9577a5c1601e291916e4bdd9c32d732ff3842af8be
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10800 bytes
SHA-256: 0434868dfca88c74d56039b0289b291f4c700b8ef0610ce5bab6e55320b65fa9
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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