Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d3b4d8e7a8a579…

MALICIOUS

PDF

82.8 KB Created: 2021-07-23 14:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 455d9bda99d95d5d1ef121df0b83864a SHA-1: 69d4dbade2f29ca7d366615aa649926ac898015c SHA-256: e4d3b4d8e7a8a57957d194cc79bdbd9206a500dc25b6086429ab01f6f98e03ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer, while the link farm indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018e933637---27464865629.pdf In PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/navutamukepewaliwubanafa.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/24249376272.pdfIn PDF document text
    • https://abeess.com/userfiles/file/detujowag.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zudojesulawuzut.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/42256076312.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f45f85cee---rosukepopiwimivex.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zoripobamekopupozetozo.pdfIn PDF document text
    • https://majubesar.com/contents//files/wovowigosoxajogolek.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/zizidefujo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/27577407325.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5d9fc43b3bd68672defad81a527f1c74/63735320770.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/15fdfabf82640152c394f5c583b99837/63209957613.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/90623553157.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083260465110---filonilinemore.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/kqgem313nt6bpl6e6bgtusfath/14107957992.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/68220b886032344dfd5454ddf8c7d6f2/13925968995.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sorefebesazokila.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/292118473769.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/tufejabulif.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f3400d176791cc7bdaf5932f8af46158/70352855642.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/44923308722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=actividades+de+matem%C3%A1ticas+para+tercer+grado+de+primaria+pdfPDF 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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 11040 bytes
SHA-256: c4da225a995fa9f8716694546642bb8fdec35625353e063e2984ba9069f83516
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 18148 bytes
SHA-256: 606791434be1663f4b310d17b9facdbab41eab5fd81321ff0b0a0dec3f5a8879
font_02_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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