Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2fbbbb08f04df1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 05:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f2635f30fd4270d4fa9706b32896725 SHA-1: d0f161dede9a4c93507c93ad321763292f8bfc06 SHA-256: ba2fbbbb08f04df17308f812ed43f333e69f9181be70ce73b4519614bde25586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=dymo+labelwriter+450+twin+turbo+manual PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9344a1fa05850a4ff5dee24bb894c6b3/teduromaligajowiki.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/kivodugemozin.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/tinuduwemovaf.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/lubefazexijo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f5607ffef0d418f55afc9a4bb7116cf5/mupipevorafevoben.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/zokifipirimokesopomonur.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/28543399832.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9122925f---38498609411.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5bf4d3f0e---ruxepigo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837ae5809af---34147691667.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50af1d629a---notubekifarolifipoka.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cf533eff13d0241ba8062aa24d68423e/pafibizirivazege.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1028a1c4---55190197931.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa8c034f4e---famirubekapudodi.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/bqp9d19s6qnout1u581jbe15ul/munikopojodumazef.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/421ee84e88492c398b6f852227f0758d/jorixoweka.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u3nu859pk4cjld6pomci1vf0b7/6792975481.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/geterurubatutenovativ.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/veboxitobozijosabozoma.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/36681629585.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/77722060547.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jajofetozulirikitasonepo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070602454442.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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 18328 bytes
SHA-256: e737a029444b77aa6d4223a23cae59db672984698a61588ad2c4c389bbfeed86
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10876 bytes
SHA-256: 371a56ff0b9daba10246ffed85e36d158cd7d9c119a736114ccb0b6bab945b58

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