Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace8402a80d1716d…

MALICIOUS

PDF

79.5 KB Created: 2021-06-26 00:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5ef747381b46f9ee98df5c2f806e7901 SHA-1: cc73eb1f5ecfcd70d331de4ac2b3aad0d19b9a86 SHA-256: ace8402a80d1716d5253218c0c1df497c993f81a9737d216a4c2acbdba7683dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure malicious destinations through a network of disposable and compromised domains. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.advokat.com/app/webroot/img/fck/file/70957452926.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d0f368c70227e0cb6d201e05f8a502ce/jonugites.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/418e09126149d456b1d8777040d7f531/zividezajegirel.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ba88a8794945cffce2849559efc8ac09/45215342786.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/59642462549.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607869adee06a---xenonugufijixexululoxurug.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a0c94df3---xabuvezurimuweberewi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53285eb108---jefogafad.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/nujogop.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e906af99d568bbc1de4f5ea93e80b55a/80968092904.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/tupluqhnfq3j9epope2985780s/nefuletorawow.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/l1fcpmme0avbgldk9ssvc8tqsu/53452129458.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a15d8a61d---90796088070.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gixiwoso.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/17484913843.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5423e6f10---46830274092.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce204315f---53452027715.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/kaxaw.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/niloz.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9d05a11a---58085415249.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/40453433618.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe669bef2c---95524646657.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6bb00f218c95a81ffdd1b8398caa001e/perukaket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+doc+to+pdf+in+ms+wordPDF 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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 10716 bytes
SHA-256: 1389d2a5b6f1ae4b73fbbb8e8b3218eeeedaa6695ad66a3bcce126c63e793036
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 17244 bytes
SHA-256: 1c9257d23b9f279f0bc018ec9fc2c1228dad4f468919d1e561fc3a5f65c3acb1

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