Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1d5a459f2b5645…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 20:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 542c42afa6d35d5e4e1a663d5550064f SHA-1: e2e1530d5718d84e2919893b319ce6f32b0bb0ef SHA-256: 6a1d5a459f2b5645279fa189c3a5aabea9cfd51c0efb18d87f47902d5ca97752
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 a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=septic+tank+operation PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f9ggn4om1flirh971egspeotlp/43849672549.pdfIn PDF document text
    • https://unitjaya.com/contents//files/tagujojiw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f5b0a303---71436802446.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9565eebb29775ff3e6d5b6a0a4c0fdb/93141166751.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e266a37398cbeecda15c63beee2dbd6c/zajenevumadubuniniriwivi.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/viwivafi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077df3533ad8---puwigufutexofip.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/43559172932.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021050718532573499.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/45680030430.pdfIn PDF document text
    • http://emauto.lv/index/images/up/file/56972891966.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d90cfdf8---zuxozalimipobawowi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcfb71250---zesunuposewidimejuw.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/31977471350.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba489f370b---kufodibodoviwikejopoxiwew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a264ab3dd5d---nobigipasop.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d09a0b93---logomi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d14ba89a---87287288556.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/63602931798.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965996f20d7---12388779160.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3584b161a---84812493755.pdfIn PDF document text
    • https://etimes.mn/uploads/files/xitizowuzaviweda.pdfIn 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://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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10320 bytes
SHA-256: 3cc34ef8f147708bd0a3e1e056f5123ab0dc8c3e11c13c932a7f6ccf2fb3cbaa
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 17020 bytes
SHA-256: b6942486675db0d53438e1b6317cc13903345d5289ff26c6e2f0184b8d130d9e
font_02_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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