Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f4d8e48bbeaef…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 23:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c7d5160c93d3100ebb63e78e0ce9988 SHA-1: d9a274b459529942ddfa5e592dfc5a3917fe62fd SHA-256: 9b8f4d8e48bbeaef17ef938e1183af864d02c804f9085bfcd4b6e9b6a248979f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm utilizing compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The embedded URLs point to various domains, many of which are associated with compromised WordPress installations, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4se3p5ld3pdobo9p2vpjc03j1h/44046296908.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e27bc944---41776349397.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a8598ebb---71321660010.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210528093641.pdf
    • http://nutronicltd.com/userfiles/file/11816950386.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e304dd1f7---siwixaber.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806162684ce---xerazeforemafux.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a03906ef45d---nizoditiforumesosalivawi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d438ac1a7b---jupikadenus.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/99334449500.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3096985a5ff2210ae050d1334e71a283/puxilelofi.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848591188f1---47003080732.pdf
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/wiborebijefatoxe.pdf
    • https://fanaf.comarticle_ressources/file/gimobutesevowe.pdf
    • http://anbao.vn/uploads/userfiles/file/12615389208.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790a5841b9e---sokijulaf.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/50823511392.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/blloaecq669talj7duhmct5ns0/87977286348.pdf
    • https://efnnma.org/files/file/zuxigo.pdf
    • http://www.chubsorn.com/file/files/66983255984.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0f8ac3b6---92069818215.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3356f664---kesado.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=factor+tree+of+150
    • 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_off0000e605.bin
dd8cece644f1f7f37132ff98087d2f67b50e68d9cc83f905270e6ccf0fc9e36a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10204 bytes
font_01_sfnt_off0000fd24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16792 bytes
font_02_sfnt_off00011536.bin
6ff81fae4a3bd621dd7fbf8cbb55b3e952d9d0bcf9ff58304bc0d96b107c54c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 17484 bytes