Malicious PDF — malware analysis report

Static analysis result for SHA-256 174664799e7b369f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 11:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e8896a3122f55fe9b074c4d35cf3b54 SHA-1: b001a8b8b6cb73fe4b3dac4ac3edfbde7cbab9f1 SHA-256: 174664799e7b369f3bd940aba419b1be9d8861fdf7ac216775f8411b5e6bad7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These sites, in turn, host other PDF files, suggesting a chain of redirection designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e2vai188k7uouj1pjup16ndvhr/jaloxu.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fe41b0e3de79643a1e9e9f91f93355c2/fibesifitu.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/79970513779.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/44194737718.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/85902355027.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/botobaxudas.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/fipapeneferasikamixareju.pdfIn PDF document text
    • http://arslanemlak.com/E/file/jisigenelajadawawa.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/48741361947.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8784c7cf0.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/j69u59lsvbgnkf6mh28msr81r4/23158859436.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/30691651953.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ubiimmvn2oidb9bmm58cb9cp6s/dazuketobusatinix.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/34459929477.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/110a49b391a6b5c4aa22ae2582873c17/lamofevima.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e33b88b542d1b0532ffd022ec47a9f25/muvufurosimosevek.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a87fdf1f4---konezajane.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/fojunapomovabunekoni.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tenide.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de9bc935542---repuwebozapetaxajam.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4c9b18076b915f82c3e284e21bdb8baf/jutojivevebimij.pdfIn PDF document text
    • https://nexusmediation.nl/files/81825680117.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/88627409838.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdc3c6665---11072451330.pdfIn PDF document text
    • http://orem.mn/uploads/files/92351226537.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6abbd0760---2043072331.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/figinozabikotugawivuwebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exercices+trigonom%C3%A9trie+1%C3%A8re+s+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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 20980 bytes
SHA-256: 9aff32940ce6f8c01c5a1d31f250d91ced245e2f166bc9e79682199733a086c7
font_01_sfnt_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 11204 bytes
SHA-256: 36733d2fbc3634ca5256b91f8d1435d0e8e675a2bbe9b538bd8e0bc608e92227