Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d448fcbe829163c…

MALICIOUS

PDF

93.7 KB Created: 2021-08-30 00:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bc671dd7d615788fa5fcedea2a7f466 SHA-1: d633b9c18a04b9ba0c92e3261f199293f093fcc1 SHA-256: 7d448fcbe829163c126ae04f558df23190cb772c6777a8b2f668fd874ced46b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests it may be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sk-massimo.com/js/upload/files/ruderakuwagiravepu.pdf In PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xibugejadugedine.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/6734571477.pdfIn PDF document text
    • http://abnicum.ru/files/file/lerujuvefoz.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/dedudexomumijuwurekewib.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3ec81583---91198293468.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/wuzixepexusexamap.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bba9538a9cd496c1c077f348e67379f4/porebukufudejamobeg.pdfIn PDF document text
    • http://generaldistco.com/images/file/lobimunabutebomenokobinox.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/46364661360.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/vuzofadim.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/konubomakozi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7b19edd6---poduwulaxugapasuziwoxi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a73e9199d---42863330378.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa519cef37---zewimawabadu.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/jekizibege.pdfIn PDF document text
    • http://thedreams.cz/files/ruduzezekukopopop.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c91f4a4ff---perere.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/44983013882.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870037e5637---wudokavidexugebid.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4a0d6689141df88400eb3574570d85c6/durorekivi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b4b9a638---56465805758.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad6caafd23---61126856634.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/a6802debd3ff2a64f0ca97817b22904b/suwifitilidodinepajogino.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/67239819651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=present+or+past+tense+on+resumePDF 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_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 17604 bytes
SHA-256: 6aa41256c547ad66f7a5b2616ad974689572644baa870d4ad736c5989dddb5e6
font_01_sfnt_off000138c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DB 10376 bytes
SHA-256: 4b05f38fb16768f83f410d5dfcd2dff44e79c760499f1918bf9e35d62cff86cc

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