Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c167e50d86144b…

MALICIOUS

PDF

109.6 KB Created: 2021-07-07 20:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 663f3eecce39aaf1632309a7870629cf SHA-1: 62d22ab0f6f717b1eae665630a84698845b8e8ff SHA-256: 68c167e50d86144bfd269668985a81e37b6c28ea2989e24ffc7d7b0bc6345823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=magnesium+ribbon+burns+with+which+coloured+flame+in+presence+of+air PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5244aaf---76818911818.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/xaligur.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc5f837393---22001935605.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damizulirorijofaj.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3sku266p6r2i4oibrqnep7f32m/juluwezikuzir.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/dc51f050c2a076ea9d317d6635273b4f/61917075740.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b678c340e37---54576749017.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/efdc1190b35d18776667af2dad436b84/jatuwok.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dadb2c08e8ef197bc7f043bcaf8f5162/43521721421.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m3oojdt7jbc7fn6tk38ffph234/10018754154.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1cbe48f28---57391438101.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/caaeaa4b6e2b8abaf263faef5aa0adb5/9631040405.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/44174674587.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c4be57b8---34299816000.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3c126002b43c88881af3bda660432108/53656363492.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zovumekazixakidolefazan.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gv7oi8b11i1mbk508j438b40v5/58887469529.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/323bf2d4d9923436b3dd2ea59de5b812/nizijuwizuzexok.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/002886191adbb34c1088cbba992ab170/vexar.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5ce8a030118054ffd616113c11d2e32/17421737149.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kodutavuza.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/69313756507.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1f842e7aa1edfc49b63d99a194adb18e/96227858855.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f22a02a2ef5ce1b7b39546131188aa27/35558731515.pdfIn PDF document text
    • 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_off000148ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CE 11388 bytes
SHA-256: 6c765413eafdf27535327c2c5626923cc1ef6f15da1280e2caca3bbe0aa406ad
font_01_sfnt_off00016318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16318 17228 bytes
SHA-256: d1289669ef3dbc5ff1e80c39b38540a4416855f36d98700b2b9adf6dd7328ea8
font_02_sfnt_off00019056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1