Malicious PDF — malware analysis report

Static analysis result for SHA-256 398fbe447d5edbce…

MALICIOUS

PDF

80.3 KB Created: 2021-08-10 18:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9a363387943a5db0838a08806ba2e062 SHA-1: adcb2a9cf42fcf212f82fcaf41cbfb3be8088dd8 SHA-256: 398fbe447d5edbce57bfa08ee348d155879b31d783a8ecb053728a53e931b409
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a focus on link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/66111529320.pdf In PDF document text
    • https://monyetjoget.com/contents//files/63641942270.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/23812631606.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6a73ef8fc068ea8921b8755808bbe51f/70669629822.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d459882d---muxojudarokuxozideg.pdfIn PDF document text
    • http://kbchina.de/upload/76451514394.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107292227351220.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d74501cb---zuvikexijilekabipowuwu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20eca7ced---75856916506.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/49683995266.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/faraxosulixe.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/42ef2dcba48fb3ce5f35f3be09af2eda/mepudabugojarovig.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609099393ab3a---vejabitezul.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/13353112255.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/17037369891.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbd71bad9a---xolerof.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/71150220311.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/pamutizasowaziputirizaxaz.pdfIn PDF document text
    • http://samtekelektrik.com/files/pakixadeludimi.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/92329924428.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/74058798532.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uzedezipuzemaze.pdfIn PDF document text
    • http://eventechsite.com/files/files/rikoxobiwazozuvupep.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bks0kq57p3h9j8g81tn1doac21/65826209430.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bl36tutogc43c6oak0rrdj322k/nasojugifevigonerewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=administracion+de+recursos+humanos+gary+dessler+14+edicion+pdf+gratisPDF link annotation
    • 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_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 11392 bytes
SHA-256: 955afaf9c700a3ba443f73e7b150882740c95eb51135e4dabfbe369479cb8560
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 20032 bytes
SHA-256: 8a140d2550dfa4c2ef3c58794c37882b82ffd2355d6400e4a2251374bf3f5201