Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c988f83ef6f16f9…

MALICIOUS

PDF

127.4 KB Created: 2021-06-09 02:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2787734aa0fb38328be9565997ac7e8b SHA-1: 4c0bff4e42555c48ba374fdd307df4c0bdfcb534 SHA-256: 6c988f83ef6f16f906072b631d11ff600c0bd52a1c78252589e698bd137a6bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs on compromised WordPress sites, likely to distribute further malware or phishing content. The document body, though heavily obfuscated, contains references to "calculus bangla pdf book download", suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=calculus+bangla+pdf+book+download PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607847cc73ba8---93524459096.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/vejada.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/80740645999.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0d91832cbe59009f24de7cb177ab4da7/bemejumasuruxi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ff0c3f42cd9c0e744a2f53d91a2f1b02/41890720916.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1040b44e3---69327682823.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094587f1860f---gupusefuxoxuditu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97923c500---96270175904.pdfIn PDF document text
    • https://rosycaffe.com/file/48739092130.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee009a330---bulisifewexejotubozi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e47a8ae6---47621332068.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ds5o7pnk7clhjedn80iqj5u56u/3925654212.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/daea159dd1e919a1eee63f7e456c6789/58537589996.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/nojaxim.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/bazibagelatukoba.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/93793944450.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6p1fa55dqdv5g5e26g64897u7/43300262442.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2816f49fd1---30981557086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00019df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF2 5428 bytes
SHA-256: 30e996b9388a6853fa242a319517a1df819fc01607d290fb75a063932e73e24c
font_01_sfnt_off0001b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B089 13220 bytes
SHA-256: b8fb64371aaef698d8c53328cbc829f5ec86a97ec4d4236b7c19aa1030c33bad
font_02_sfnt_off0001db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB9B 16112 bytes
SHA-256: 1c8dc9f536ed742514de24f2fca3984a6271a3bf73f12a189e79928522958ace

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