Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fb3601515d15cc…

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 17:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0136bc69621ee4d21513fdba3705643 SHA-1: 1d4781701d66d174c115566bfd0578df77c14b1c SHA-256: 01fb3601515d15cc720f663d2a3a2c4480320a2723245a6245c1bbf1290641d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the overall structure and heuristic firings suggest the PDF is intended to deceive users into downloading further malicious payloads, likely through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://eclearusa.com/images/file/25970803309.pdf In PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/dinujunujinogud.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/rijox.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/tixogizajusonet.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/telobajuzopiwu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r6vps0u1n8inm32p9t5js8usq7/62567241227.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2gkqgc6v3eam204g3uc6gdvlg7/8526565916.pdfIn PDF document text
    • https://advik.net/userfiles/file/39044999237.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/58628641436.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jopagilonivozifivunaror.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/jolazajolerekalasawavu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d846ec19586---posiligefene.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4f26041c---puzobibavarom.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046c66944---mewewibevinorelinorenepe.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/49020044221.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/85607513462.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/50843188539.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607319da39baa---53303092913.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ebjn2b5rd8orst07c1ql9ncc5i/22506630977.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582fed2191---jonupepesijixafudeduvavib.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/peluvalikagudus.pdfIn PDF document text
    • http://remobudostol.pl/pliki/49677427270.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/22922325156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=guitar+chords+book+pdf+free+downloadPDF 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 18444 bytes
SHA-256: cf520fdae46a9f807d623b7bfdf4d0921e17129016dcf31acd75c0621fb45014
font_02_sfnt_off00013546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13546 11172 bytes
SHA-256: 51f9b1740bddb46b1100198c52a8b25717690bdd6416f86ee839e38a8c5f2734

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