Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c636b17689a81e0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 17:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d43f07ba878e31299546d4b68ec10df9 SHA-1: bc93c5f763c3cfb488da971b744628c856d7db54 SHA-256: 2c636b17689a81e0c0a5f217bc11f8ce7099dcf833a29ee94348a53e4df40296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e3c994c72db5ee3c978f2cfdefe83311/58958773814.pdf In PDF document text
    • http://cichanski.com/Upload/file/lirisuzedixukevive.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/babozasa.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/58760410474.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d06c76c234f77b6aa5a3c8828cbcc446/xufuxim.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/47065471392.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dumewixufugofogazufoxo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891889f424---fowaxixol.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/zazobok.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24d858d76---92121229118.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gopubebufegemisupol.pdfIn PDF document text
    • http://aquatherm-graz.at/files/69624019638.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/10329354687.pdfIn PDF document text
    • https://dafelia.com/files/darunidutu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/cu57t2mndhlt1fegl4vfhj0j5s/riferenoz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02ddfccf64bff58b4c0d3dc8ee89b96a/16075304943.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/99788516373.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/33368268796.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/670c3842e3b5af2da0939b400bbbfa91/75350727950.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085963a50098---75401310306.pdfIn PDF document text
    • http://charivne.info/images/file/48803759844.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4e3d48bc---likimezogox.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1a320d94fecaff24e8eb865f4e74d024/37942826498.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/puwez.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/87196949884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cfh+to+thermsPDF 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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 10104 bytes
SHA-256: e867f1e8fb877c82cd61802b02719d97b1944f8b76e5571e19966e3da2e6ffce
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 18688 bytes
SHA-256: 6dfa77e1e65d9df770e6eee7bb73e56c80fbe5f95fd8b57647d96e9eaf277c5e