Malicious PDF — malware analysis report

Static analysis result for SHA-256 7567c345f8bf3fd2…

MALICIOUS

PDF

104.3 KB Created: 2021-07-05 11:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d9d19df35947cde798de5bbd1305a2e SHA-1: 4380113a89a19976ed6b477b7eae728bbc8c979a SHA-256: 7567c345f8bf3fd292f9142cfc889810274616e30e7d681aac0a49e65ad66b12
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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 https://samowar.ch/upload/file/42567011558.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076372eafbfd---9886532529.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26b7d305b2---rokepusujipajuko.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/48492939814.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/sewojuwirixagapata.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/56738366410.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097535e29d9f---13291946083.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8f4ff7ffe22cbfcdb842230129dd9453/dozizomaja.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/21920845289.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/evjn4144asdpei7b7to9qpjt3f/59007621292.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/tirikixesesivovepopilu.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8fc202e93f7e14d84070886529f42997/geduj.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3tbfc4jq3draqqr1o7rke9rqja/dufijezido.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/26f8b97d0ba2430d8767fa4db6bc49c2/23458102547.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6c4fbec98f7350c229658b132b568b37/47671614948.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/85146005564.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b475b26f346262d44b10acd17746758e/61889393756.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0159b77f---53469664284.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61586424204.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/415a23abc493bf46f5bdea724c633c7f/kavasodevifeneruwenago.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/52721626075.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/73535379618.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/32293285614.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45058d94b---gofasavedilexerux.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/dirulet.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef53eaaa9f---68887233515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=im+on+my+way+i+still+remember+these+old+country+lanesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 20120 bytes
SHA-256: eb1387b7565c9fa321b8d291dd1eafef6253c0744470fe88e13d7f617a38402e
font_01_sfnt_off000145d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D8 17676 bytes
SHA-256: d6f7ea04724b131eca9508e67ba26946c57a47ae0b0ddae3d700a298ebddc808
font_02_sfnt_off00016115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16115 11028 bytes
SHA-256: f5b4ec32b67898cc7ce58568284bf061c382d3d0fefad0708dfec6fc98248320
font_03_sfnt_off00017a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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