Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eab859042d223a…

MALICIOUS

PDF

87.8 KB Created: 2021-07-23 04:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d621f5b4b398c2a3557f1d8b08f7231 SHA-1: db4b0262a861660f91f9ade9a6e69444f0066400 SHA-256: 28eab859042d223a93d4200e3826edcd5984d58eb976753ba5aed429c7dfb3a2
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vm2t6dfjsme1a74tjtv2fh5pj6/xojetumaxekipudodus.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd527b217b---44926023375.pdfIn PDF document text
    • https://noddy.nu/images/file/24489827948.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210506170628.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f421b883b8---46794267284.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/55144479525.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/sumasinin.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/reraluno.pdfIn PDF document text
    • https://paperland.bg/uploads/file/66162536175.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/6918521019.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32694a1c5---zasonurevuba.pdfIn PDF document text
    • http://groupkaishan.com/d/files/40257715886.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160766564716d0---15873532670.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9b96983b8b4482065a96c4151512d73d/67422045604.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/75481780356.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/14617104488.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5dc979de3---balelugogunigajapekiro.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ac233b7544f624fd984f5c44588f6467/11239876283.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db457b390b---tawijezipomixevisu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc296d4c9---rupazudolifopotibadomum.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/7411027344.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/79927362287.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xekamitumaxi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/984b5ee853a7e754c06d22031b1f70e6/lenomivazipaluzewitojewul.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f1b35308---63000021216.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/bokoxebimegebusijafiduxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=class+8+english+version+science+bookPDF 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_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 17116 bytes
SHA-256: 245562842647039d152fddaa45a9785f63216fc291fb166854352c18e170ae3b
font_02_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 10948 bytes
SHA-256: 6424ba5bb32b9ed24c985f7e4962742fe439876965a8e34ac9cdc0a4ec7b147a

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