Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1135d39c0a0d21…

MALICIOUS

PDF

79.5 KB Created: 2021-07-03 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd7faff088ba3e04b855bd6daeb48ae6 SHA-1: e74928e4cc03d9282a30d1ee851477fe7550c4e4 SHA-256: 1a1135d39c0a0d21d1d53f5742f0ec388b93a938730c016c456db5da0fd53191
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4eade883829f4637f5e24b69899a0bfb/vitibipadozejuruki.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/02364428d0d1312a98db7de26f28f634/gomujokawuxufivux.pdf
    • https://technische-dokumentation-hoffmann.com/upload/files/jajulam.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/4vbu9fcbt3d9sfik408c8nsloi/89050289332.pdf
    • https://tort-art.ru/userfiles/file/20276595430.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/af74fc9cd393a3717b3448183fe96e74/52321393233.pdf
    • http://strahovka66.ru/userfiles/file/57034205322.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8e7386c1---xewutolizijiditirubiwupal.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l815q8t88mbafn09e30h9jki07/jebezafamuzutulik.pdf
    • http://windmill-bv.com/userfiles/files/78259651390.pdf
    • http://cdwy028.com/uploadfile/file/20210527063248.pdf
    • https://clickkedai.com/userfiles/file/ruvuzovobukinuravuro.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/becdc18e08f44a9dee93ea739f64ce25/11451452653.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/taruxo.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87b2772f1---nijinoxiwufeze.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/7178859258.pdf
    • https://bikeid.net/ckfinder/userfiles/files/85813394547.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/22399734197.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0757a8a57d255c0a12ffdc1c425a6488/sorisipibokolaxiget.pdf
    • https://namlongadc.vn/uploads/news/files/lawapibe.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941693c2a8a---toxidakofiwuzoroxisigo.pdf
    • https://paperland.bg/uploads/file/99815118899.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3be7d0810e---23540092495.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/df3a24feccb59b189df5bdc7f43000ba/75457393720.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=color+with+letter+h
    • 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_off0000d550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16792 bytes
font_01_sfnt_off0000ed62.bin
14ee9236db8ea301610ff3ce19febac931104da88fa19ae5a150f95916a48a07
pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 17780 bytes
font_02_sfnt_off00011abf.bin
6e125be19dc5db4d3a9af7801a1d7e1c5bb1720a5c2a717819e45e0cc0fc95ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 9888 bytes