Malicious PDF — malware analysis report

Static analysis result for SHA-256 c066234916d70b4f…

MALICIOUS

PDF

82.7 KB Created: 2021-07-13 07:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ee9130aedfb259ffd2df9ff6ef81a15 SHA-1: 888b8e33b17314f29bea0307f1fe9cae32eddd08 SHA-256: c066234916d70b4ff14457e79b59da594d69c0008f090895e8ce92042f069030
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It exhibits characteristics of a payment redirection lure, suggesting an attempt to trick users into clicking links that lead to compromised websites. The embedded URLs, particularly those pointing to WordPress upload directories and link farms on disposable hosting, reinforce this assessment. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ural-aiti.ru/admin/ckfinder/userfiles/files/37705349363.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pdos20in5hf4uc2tqc8ipbif6n/69309555254.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/36504818790.pdf
    • http://quangphong.vn/uploads/image/files/43784045901.pdf
    • https://psychologgia.pl/Upload/file/kidigaxukemawepebi.pdf
    • https://gelblighting.com/userfiles/files/78304016901.pdf
    • https://jagamimpi.org/contents//files/takawilezigonipe.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78cacf60e---33540534839.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/82981518677.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a88579ce3---57640466424.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087656b6428e---lebadalisogasufubogas.pdf
    • http://dichvu12h.net/userfiles/file/jerumugupi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf73f0f363---sovug.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/32e0fa3c9f7e12c4e67f7ab4af54aa5c/73239911093.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/acb3158eb4a323acaae9fe7114fc3e0d/71335206782.pdf
    • https://tanthueviet.vn/img_data/files/rutefojo.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210627_E65760E25D99D0CE.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c535c63aa1---ribixezedamu.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/11fe9mq0e5blabomqsonlsit60/zesanajipurekanoxasol.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/46266484721.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1d258d43face649116bed05d5ffc476d/10537791237.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec766aafb---63123232518.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hire+purchase+asset
    • 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_off0000e227.bin
797f1ca366e5cc24bb5dd3fdb8e598058e4cf12ac9492d024827b7a50b74fef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 10292 bytes
font_01_sfnt_off0000f974.bin
0266547890573c4605901dd2641ddf74da0d8b459573a51709e824f8b975a1f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 17080 bytes
font_02_sfnt_off000125e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 16792 bytes