Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff5005ad02a275c…

MALICIOUS

PDF

81.8 KB Created: 2021-08-21 23:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b7dafd2233c4cdbce68b9155c58902e SHA-1: bc45aa6e0d0ceb3e737964a4652719b13d3b4ab3 SHA-256: 4ff5005ad02a275c82a6d8dace61569d6ebbbc2574b39d5e36d344ff01ccc756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic findings point to a clear intent to exploit user navigation to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=delf+b1+production+ecrite+topics PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607259ccea679---bowiwolozomoja.pdfIn PDF document text
    • http://bscartridge.com/pic/fofijezunikodesik.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/68311189796.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/bikozuvipusejuw.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9871fc63d313975574977bab43084e0/vajogopajibexamepafebobi.pdfIn PDF document text
    • https://mar3ol.com/Files/files/tirunozifurapu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bulezarazenolutibojakole.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/dilusujijura.pdfIn PDF document text
    • http://rsst77.ru/upload/files/wozow.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/derelar.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/26h6qkf0i5nrlga4aj9v9gdo72/talepof.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/13281371942.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8671dd1789---29018090879.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faac5ed83c---99431392013.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097111e88a65---siregodanabunufatitab.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d831034ada1---rowerojazuwadaleg.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/941c694da0840dbdbeda71cdead27d0f/fufivegifovufosefawatada.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tozosefamuwuxov.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1d1aa2bf3---benoromok.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/30533238691.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210616011930.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c05384ee8b895a451580b9e7edfc8d1b/ronopenokelivisero.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/874df554cae761b69ebe10f91d025a1f/84105484537.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4809e674ea997fa8e2384941d21fa53f/88870586034.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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 19392 bytes
SHA-256: 9f9177bce5395a39b00eb7f2da85917badd38be2210161d72b3f5224f98352c7
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10744 bytes
SHA-256: 437db97e75cfbdea25e6fb7423bd262b58c457215aa473e4adb16b4dd87bacc6
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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