Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d538e0285213c…

MALICIOUS

PDF

100.5 KB Created: 2021-07-24 18:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f5ebb8fccf76b1da622e179f016ac45 SHA-1: ce984dac407415e32a1d70a7129fa10f2a1d6340 SHA-256: 4a0d538e0285213cd9c28ee45ba6b8c7d0c092b6a466da90cafc64be6b71c1d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9568

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ayurvedicclinic.org/userfiles/file/53808892415.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/bdae2d80cda1873eddcdbe8ac3007bcd/66562087599.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/nrpdjff48ocj5fmurt5gsm2qh3/27954407283.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6806606f1c---kevatosi.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/27855055353.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/jofavajotuxamapojuwejomod.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/kogemujokokazuvo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/57935256559.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609673374d749---dikowaxurodalusa.pdfIn PDF document text
    • https://senhewood.com/d/files/32900491603.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/borarixapabanul.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608920b443d5f---18730413042.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/falomigumew.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40666cf1ce---80734089629.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186d0a5cc7---lunevenepubu.pdfIn PDF document text
    • http://pneusmarene.it/images/file/78508519558.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081e019267e9---fumoga.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vupbh8glb97qojq2vgoivpll52/57199838312.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/60988434050.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/33711512354717dfab75b0dd77271d3e/95004230665.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/78153500052.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4466200be89f250449a3d0ff127d7b9a/jilekekerifiperififarex.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/70524ba231a99af654934f6a98bcf866/54546652643.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/beaf3a71c2862cab2cac228507e63e33/noluxojumavonu.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/47060482949.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/87ef65e7174ff9c1c6469f7e56d6fc16/67294254830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cyber+hunter+lite+hackPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 10516 bytes
SHA-256: 74f445846fb8e23af931aeca1849f9174de777354448a562accbc3210b2f98ac
font_01_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 16908 bytes
SHA-256: ddaa5b54f550bcd41da1501000b93189df99c237e28eb708fd1660b2f2e34e89
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 19064 bytes
SHA-256: dd4575c88c8f9a88d56ce5e685732a703274ebd9d7ef0e6166c1c451082522ec
font_03_sfnt_off00015fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000177d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D4 2252 bytes
SHA-256: f6a9165ff81fcac992ebfa574775dc691d9a294a62bbcabde252cb460826c8af

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