Malicious PDF — malware analysis report

Static analysis result for SHA-256 4447f813989e2e85…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 16:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c6b271e88e06e3bbbfa331beeabba35 SHA-1: feb9aef5d898deb51fd7942b0ec680556086976d SHA-256: 4447f813989e2e85a7dfaf56c19b3cb92aef12874a2fd5ef59c0639b14337460
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, directing users to multiple suspicious URLs, some hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful content or facilitate further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=cartoon+porn+games+android
    • http://manpukulivermore.com/uploads/files/92376497838.pdf
    • https://cncunse.com/d/files/6559959144.pdf
    • http://agriturismolescuderie.eu/userfiles/files/4295834066.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6f5939bbc7320b5c8f4de67e59e1b2a3/94612482562.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140704f669a6---15340271038.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad9343fb12---61017940278.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/bevubesiro.pdf
    • http://ildongwire.com/userfiles/file/62375829173.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210905153015.pdf
    • http://curry-box-deluxe.de/userfiles/file/86652528897.pdf
    • http://campfirewtx.org/userfiles/file/57009817195.pdf
    • http://avvocato-callegaro.it/public/file/28992541721.pdf
    • http://autosoftware.company/autoresponders_images/files/36439394167.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rojifexafozoxu.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414bbac762b---84564725081.pdf
    • http://huh.hu/UserFiles/File/88148656212.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ctknu27krtmp7ph3cnemrqdbb/3915126951.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabopixufebuxixazow.pdf
    • http://indago-rovigo.it/userfiles/files/vovovigixepemawifukipilo.pdf
    • http://driver-jazda.pl/upload/file/98385509273.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/tenizuvesewobasemesilude.pdf
    • https://penzion-palice.cz/content/pufeniwala.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161461a1049a2e---puzevukoxosupik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 16792 bytes
font_01_sfnt_off0000e40c.bin
0bf6955d8fd9ecdf3b4ae7b787bb3ffc13494c78ee5d2a92eb102f221ca8c005
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 10720 bytes
font_02_sfnt_off0000fc71.bin
9119a2b6d343e32a334b4e1abca33fe0095e775da8787a2872836cd2af5ddb00
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 16552 bytes