Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cffcd04fdca2105…

MALICIOUS

PDF

84.2 KB Created: 2021-08-25 02:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3f3cbde54653bdf551d4597be11269c8 SHA-1: 7cc499a6f9de85059b549b33f22e749a063984ca SHA-256: 7cffcd04fdca2105676a7f4176968a5870538d3212f08c24324f063b2e37efc4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through compromised websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3a10ebe2---54894500535.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f54e155eac0---zasokitudozexinuvedodiso.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/wamifemo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106b884979a9---fisubobatuliwejinu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/634601d2d621f69e95f7f329158cfb1e/fifonifo.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/9630636443.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/36427393217.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/33854261708.pdfIn PDF document text
    • https://rm-parketi.si/uploads/71512030448.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/tutoli.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/radedozinowanosaf.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/410174205.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f47cbc34---taxodiferi.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/32786859154.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66670959538.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/43363945907.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/mezemalutaguxowuvij.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb2eb5c9c---86300606294.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jefijixirewew.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/92602798450.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b4ed443c---10221520048.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/nogak.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/49116724808.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856eb73f0d2---jovuvan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bachelor+of+commerce+electivesPDF 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_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10616 bytes
SHA-256: 60be832ce27ab22a428ff6011843b870b4341d81301cf710a860b2439d17c1c8
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 16604 bytes
SHA-256: f33e4dff6cfbbf7c9ea68cdef1ba5d14e8432692538c6331039e0d5c60587a96
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1