Malicious PDF — malware analysis report

Static analysis result for SHA-256 b653e4dc5d56222f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 18:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40a4edc91c586ff903367c03ea63c049 SHA-1: e1a8301a3bba37445d5ad3fbfc09647c583d88a7 SHA-256: b653e4dc5d56222fdeb61187c259a701e77db8d0c4003c60a981bef1351e0622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=download+samurai+2+vengeance+mod+apk PDF link annotation
    • https://unosms.us/userfiles/file/mutatexedisoduwefat.pdfIn PDF document text
    • https://emenu.hu/editor_up/96427108591.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2aac55f4---35837445052.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/68269552333.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210906201836.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/94567350002.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6fd3b813c8ceec6f87f9c23328488fd0/padarapebimarimewudawozuw.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/87352869253.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/munaguzifuwosovek.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/xuxonar.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/kikekebiwisok.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i3sisj4tct6jrdpv8vrnfd2876/87666045393.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/vaxog.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/14964855951.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/luboti.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipedafobilad.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jetutekutuvota.pdfIn PDF document text
    • http://quranday.org/userfiles/file/suvozogopitivasinogeta.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/8508539728.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/28282503758.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5ca0983e313e40b3c17a2c323e64b269/64512416428.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 20996 bytes
SHA-256: 3b331fff2abb982c876a3bec729e088285dd019dcd0c17b333587eee97ba0726
font_03_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 11224 bytes
SHA-256: c47ae1683fc53ea8efd79ed3b39d1b8398aa219da5fdf1f3997aab33dba7200a

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