Malicious PDF — malware analysis report

Static analysis result for SHA-256 656399ed6a0f1b69…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 17:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 360d89c0d61b03b2888f04c2b7ecf0d6 SHA-1: b7b3730332760d45dd0bd1be74569b62dc2c74a0 SHA-256: 656399ed6a0f1b69d8f9fab50a5c7f85373b3c95896bd22c9238f8257fd733cd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • 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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad1107a38---23210800598.pdf In PDF document text
    • https://equantumconsulting.com/files/files/famivogaz.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02759bfe1---wigejurukumola.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c4b5eaead3b9d6e2ad64bb1abd4904ce/kunaz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b261c3cd178e49f3d1c2a638cb572dd7/jopetupirikejizukakazofew.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f2869a6839f777598e6770b18ff4f199/temunuwitobamitelem.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/baterakako.pdfIn PDF document text
    • https://grnca.org/img/files/files/sezawulerisusap.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f98489707738a4da245a535342e6799c/21001424518.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/64829192624.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/vunevuzitunarifav.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/49184284130.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/fcc305832ab5aeea154d33b7c94a67c5/mifabefobe.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/zowikoxukepibapu.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/nopavuniwurajomigapam.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/3038893559.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/mekumonesunumoz.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/silalegegutirorajelevum.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f2950d794057c5a126edaf69aa2d05fa/28630364420.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/60573506668.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/45370813231.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3998394517---roxofuv.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091b48061e84---42462520222.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/pumavizivegedekakimut.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/26110414032.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502042533118.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b520a6433---wifitinulidoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=solving+inequalities+worksheet+grade+8PDF 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_off0000c020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC020 11300 bytes
SHA-256: 9557bef40b77f2f7b8fcc8e92f511f62d5cd8b8fcc4aa5c7b95ede4ca8b0f425
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 17336 bytes
SHA-256: 92c1e3e21444d096101f5a297a63143c15808d4ddc028e2b17fbf9f67df43cc1
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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