Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae377edc1e530f9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a620d45d1a21c81101facf8ddcd30553 SHA-1: b9145e92c4acc162b9d28de73a6dcc5fc8b39be6 SHA-256: 6ae377edc1e530f908e3a599eb44a211174fa4ebe2b85f960e0a6a7b904cbd07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are structured as link farms pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=deepl+translator+android+app PDF link annotation
    • http://modaxch.com/userfiles/files/8402077322.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/bifado.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/1950495595.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/libemibijapinagaz.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/53905174096.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/13984990584.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/46579531101.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/farenigomewumipepitajale.pdfIn PDF document text
    • https://wonkingchina.com/d/files/12716162299.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a258c100b0eb9d1f3f5e0abacac6c953/tigawuxow.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3fb7eb279c964c004be11e7690d3e07d/zozob.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/85456525883.pdfIn PDF document text
    • http://apothepharma.com/upload/files/96461188824.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/82912465749.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/47356401945.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/rakojisuxalilowa.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/86898448273.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5c44e51c---74219003453.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b97483a543---tifuvu.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/nemogijusudosisidivegad.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pefima.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/xegonogotu.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/bikimegakiduvosejinaripat.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zokofojokefelukon.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0b90a1462d2d970340b3122144d82894/23673061663.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/wavobiniputis.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 10388 bytes
SHA-256: ad111248b37ca52f4c01423d01aeda5f8c03318db1d8e6a8db20f32c61452d95
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 18484 bytes
SHA-256: fdacbb0098878a7de9513244e48787280b513f3dd14d2e7f50b1603429202028