Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ebb34b7bccaa88…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4685ad1259a425eef918d6c08ab77646 SHA-1: 3e3150e05c60ee3580a5dca45b1ec736acb09fde SHA-256: 45ebb34b7bccaa88ad0596ffe4cc936614a31d037e6b6a686821baa927aabbee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm pointing to compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://www.masozilina.sk/ckfinder/userfiles/files/68078930667.pdf In PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gusepujuvosuluxikozitete.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bdec8be7f73044bea757e11bd10c1925/88723663252.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/laluperovibofiso.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/detozafanilaz.pdfIn PDF document text
    • http://travellerisland.com/files/55053045464.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xajuroronaxidibalukow.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/narusaxumivupogekega.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53a79daad---fejadudomelos.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tiboketi.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tewosofunejefikujemuwit.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/614468901a1b8.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/48863362011.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/wunijezogirejejo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210903151645.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31730819557.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/56855379634.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/depabavoviduxawowepovani.pdfIn PDF document text
    • http://orthopediedelft.eu/files/59092845636.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/61789386560.pdfIn PDF document text
    • https://sinarwaja.com/account/files/xagav.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xosotinefilinorugajigi.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/96243777439.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e7da2efd4---zapowixowebapuzabajegut.pdfIn PDF document text
    • http://pasaru.com/upload/files/sasowuzopudenakapikig.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/11016724204.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/46778421815.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/97117916427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+app+snack+videoPDF 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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 17336 bytes
SHA-256: d86855f5ad601727dc18d44d78db3ebd692d7cc1faec0e4bf484e46f55f02f2f
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 10404 bytes
SHA-256: 4235c722789bf6f445a22dde6ef5a591b44a3054bee6b5e98f8b3410e54c4eed
font_02_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1