Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c6e01b18f7b70…

MALICIOUS

PDF

90.0 KB Created: 2021-07-28 02:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d63b43e5242be04605ecbe2bf82703a SHA-1: db02ac810187588938a0a8ccc11ac07084fe9bdf SHA-256: 2f4c6e01b18f7b70def53ad10c6b24da0e024b22ddc41d7b7dcfa85561213675
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of algorithmically generated URLs and compromised WordPress uploads indicates a sophisticated distribution mechanism. The primary goal appears to be directing users to malicious PDF files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/131d5ffb065da7a6a5cd1223c21636b6/47944378003.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/15369838249.pdfIn PDF document text
    • http://dentherapia.hu/files/file/tonojavitoforuzeta.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160854a54163cd---ruwasajenaxakelezal.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/jidezelazitolelibobebe.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/85343253745.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/63746852147.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac83e11f94---26444772992.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab78ce014bc---nopedemexupexi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/8384853917.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/xagebogufujikemokug.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3e6a0fe721e7875bc200866bffca14ba/16675166542.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zuser.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/segaxalejakanuzudawune.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/55571551831.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c259132273f---wuzetafukisirovutivelek.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82df351e4---kilisemi.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/bifemujokinevebupitapakox.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9b3238c61---50469060862.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/bipudobomen.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/df48cc29af5646e786520a5e829c3e84/pisuzaxixo.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/lobipanakid.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2c9fe787b9e32bc3a3e8ba2a8268012d/dafopipajopijijebapojo.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051607505860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+gamesir+controller+on+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10892 bytes
SHA-256: 58685cf03365c1da5e0c5d6cc8eb9ef764d23c269a96d66d7db32607ade9585e
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 3552 bytes
SHA-256: a0414587ca78a05141d0f39fce75c8217e796266efa2f7363e4c44d1f463df1a
font_03_sfnt_off00012bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 17116 bytes
SHA-256: b01c823b0beaa234def7903bbbdef9dbf272f9c2859d187a0403a04eee8127ff

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