Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17d61df5b8237c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 09:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dcf1a8d2f7f930d74916f5d1a7cdf78 SHA-1: 088236c4ccdb4705af53ec7ecc6f9ad7d9f093da SHA-256: 6a17d61df5b8237c8ca0ce92f2852115e500f5546af510b6581cc36bdb642ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm. Several of these URLs lead to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=gta+3+free+download+for+android+obb PDF link annotation
    • http://pedraferro.com/files/files/fabubemimaxuziwaru.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1053294920613f9e3d583a3.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/joropawefex.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/tofitup.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/51a4d0d8cad67d26f03ca3af2905d2e1/3186144167.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130db9eba6d1---99882050584.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/40399451185.pdfIn PDF document text
    • http://redactron.com/userfiles/file/vokirufubegav.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zabigedufoliba.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/78243756203.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/jididetuvuwufijago.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140221167ce4---mafexegowipumutino.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/basidapuwexi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cb58839c5---95250549201.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/49121665552.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145652d280c4---guselanuzuladudo.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/gamelepegexakila.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/bakezezemavu.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/muvegalelifoxedajuzir.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tivunamovusekotusijiba.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/78273913460.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/pukofabaleposawujoxu.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/wemuwijikijowabari.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/vekatovuwonota.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/5675842021.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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 10616 bytes
SHA-256: 188c42785877b7c7ccf5399162a7ebbde95eca6ab18799efce47e17ad75ee009
font_01_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 18300 bytes
SHA-256: b6e932f36b53f1ad7b8600d74539325ed367b81c8b3ba865ee0acc3e11d090ec
font_02_sfnt_off00012a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1