Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f017d0fcb2ffb8…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 12:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 554a1132fbebf4c081ba945cfef24ec4 SHA-1: 1e38fec2105acdc246dd8878f92bb1ff25d30f54 SHA-256: 34f017d0fcb2ffb8f90d621d39aa64e9cc5beeee7b2979b17f6f415fd203836f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=the+wall+of+respect PDF link annotation
    • http://ubest.ru/images/file/86090223381.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd8c75cf5---wegudewapujizarojupo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/waxerokuviju.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vcgdqrekr8odr4cko7rcjo54j9/tojinutesomopoxezo.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/7983480838.pdfIn PDF document text
    • https://alutat.com/data/file/korijufobinuve.pdfIn PDF document text
    • http://fnathservices.com/upload/file/57867883616.pdfIn PDF document text
    • https://cncunse.com/d/files/pezejanutapijonol.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/tavezasagez.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0dbb6c799---30717144586.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/20560362523.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kabesimuramezujeduz.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b45fd54b2b1ad316ed977629a48135a6/24235942771.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/74742952858.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/11515413553.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/48890544958.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0335be415d3a9368441fd3bd72d45978/18983273893.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc58ba9c44---49633864847.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/77337836737.pdfIn PDF document text
    • http://redactron.com/userfiles/file/niniwamex.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/94ce04dedaf0c28f84c7707d969e5026/tilovadexamidaw.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebca65bfa---gesagekolajujelug.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/20973593892.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/jugolixin.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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 18528 bytes
SHA-256: d5380445319c3307e29f219e23004e50f917d6c56b934a9e0058ba3ccfb1196b
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 10428 bytes
SHA-256: e47dd74bb89fb3673df62e09feac4ba65d3b134cbf905bb282f1576a9f5cecf1