Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bf38ecc016ddcb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 01:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3213e6c249b562ce73a4ce56ecd97d4 SHA-1: 96c8f9c5dd8ce63324df3426a9c7f55dae040a1a SHA-256: 67bf38ecc016ddcb6d1230dded5f8f38c436781fc498e9d1dac825550c0cfc72
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised or disposable domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads. The presence of a link farm on compromised WordPress upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://onlinemidias.com/ckfinder/userfiles/files/92239684581.pdf In PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/valesefebosutuve.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/tiremusukok.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/93085605317.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/21563181800.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/ronow.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/13617941578.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/neduwulunejepodudiro.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zinasaxuf.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/bidoda.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2f846fdfd0e12f2589e83f47bd8c4ccc/79914254923.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxafijinugufigude.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c762903c2b457d11962b392d271bae7/segidakalufejopegelugeru.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/79339708431.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/16584301062.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42502c9d7---losawedibebajo.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/ganufokokodufu.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/serewupuwijasudom.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/fazivutigox.pdfIn PDF document text
    • http://sakra.sk/storage/file/50783300640.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/17005640234.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141d07e49097---lupodalolaxokejalojimev.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/xekavomavoxuso.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/23946305435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+screen+mirror+android+tvPDF 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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 17656 bytes
SHA-256: 0d26be545d333171a272f46fa538179d725cfcbe9792cdd856068c4231daa73f
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10628 bytes
SHA-256: fa9c71c0fe8a3e67f42c05d3d765e9da41be20554df3921f2cb365e687255472
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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