Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f298dec448c872f…

MALICIOUS

PDF

92.4 KB Created: 2021-07-05 17:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9873e8bbed1b566e2429811c3e0cc9b SHA-1: a558d957601dcc311d3423e4aed55a9b071b9ba9 SHA-256: 1f298dec448c872f4cd567cb5697a96e09eb1d8be6e63c7b6f4efe56d911be75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple external URIs and a link farm structure strongly supports a phishing or redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dac1084d4ca45dd1fdea6098010e6e9a/pavese.pdf In PDF document text
    • http://campbellelectronics.com/uploads/dejitafumeboripune.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/64536239890.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2b442fa3---1418298861.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/m9k58mu20au9ve5pdvdhudq0al/rovigele.pdfIn PDF document text
    • http://artepcb.com/upload/files/64491197039.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/letebudunojamo.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/kenosefiverekexili.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2cf790413baa40b55dc321c94ccd61c9/21410349555.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608894a05e922---91929580754.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b243e527a90---gesabifakazikulinizan.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/628ahvf1akubvt6gm8n81udai4/wizejanetatulifisikak.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d3815906036---64297618061.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc1866aa2---sedunetegakaf.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pslhg5jaiomfej60hd2mojegni/80326337491.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/mojepudareranelodug.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/51ltvdou3jc64vig9m3m7tgmo2/falaxoxorix.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f01cc1ff68dfaf0f43ec597081cbfd6b/77942787367.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7398db7a94000de201bd22c0f570c193/47752430490.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ab50b53a---71803410394.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/gawotisudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fortune+teller+box+from+bigPDF 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_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 17488 bytes
SHA-256: 61b1e54580a299295f42f9b0f218dcb3b93171c7ac67db43b85c2a13b0a989e4
font_01_sfnt_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 10548 bytes
SHA-256: 83710662b8c561d2d60e376dad7fd1ca1fe11cd72fa45b11d9bda0d5e17e8cbd
font_02_sfnt_off00014c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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