Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee404f4f41ac10a4…

MALICIOUS

PDF

82.2 KB Created: 2021-07-04 04:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 541354771a50d7f870b410ff96b1c1df SHA-1: 431db6dc7c972e3ff4253f5ae009e7ed88dad1c2 SHA-256: ee404f4f41ac10a4cddc2cce4cf14321126f428eed1ab6f90e9be0a42ae07603
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, which are likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan activity. No scripts were extracted, but the presence of link farms on compromised CMS uploads suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ef2db136---sunuxe.pdf In PDF document text
    • https://etadelloro.it/images/file/guxekuwizuzufepatupemerem.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v7g6i75h38jqknrd2i8i5999e4/37748933258.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/62813734742.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fd7e2a168---59116464878.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b7vk1oc33v70452osomu4ff2uj/xifirujumifaxupafegadet.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/tiwunasemoxibip.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/60837016964.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac106425ed---81270907566.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/riletojejojolekonidibat.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/51b383d594e3e69fbd1de24b5ad5d9ab/73084573471.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/gcmvtqusvfbfjmusf626sd1lvu/80090003394.pdfIn PDF document text
    • http://hasyo.net/files/file/91318071794.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/94861396485.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/48079896370.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/53337427179.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/merukevezaralu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/30cd09fe6301bc72dceaef96e5a7fe63/medefomukafop.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jeac6fjdrpki3117ogh48urbaq/pokato.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/15vs15q0i9tic1g0mqfr6fhtc4/bokogudu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6116f37133aee515480b476e5a5ea676/rakofimilojefavimujisa.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061410350273499.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/dosivuwepinalozur.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/54328068515.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cd60968ce0cbea91d0985616434aee79/bidofegetupas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=small+letter+cursive+writing+practice+worksheetsPDF 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16524 bytes
SHA-256: 85a5d424de88261021169614fe1609ffd0f090291c2356ebb3d7a7715d62000a
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 11240 bytes
SHA-256: 311b0db595ef009bc33e7f9ee9a1f78532645f55d8bd83fdcc5bc4aa46bb1741