Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a99ea1d184c83e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d53852d820628f50ee4d81ea1621e685 SHA-1: 6f70a5494091b614817e07ca7f6aa3e3f5b41996 SHA-256: c6a99ea1d184c83effc0f0ca0d9f6a417369b9a43e67c78b3958a9d6f52e0589
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various compromised websites and disposable hosting domains. The embedded URLs and the document's structure strongly suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=chapter+14+endocrine+system+worksheet+answers PDF link annotation
    • https://drsubhashawale.com/ckfinder/userfiles/files/jelezixizuwaxibu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a91a5cec004---99756380213.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2e9guorn1480jg8ggt73pom19v/49513633324.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/edfa604eb0d84349aaa6fd2275a28b00/diguvo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tcpk6pfug8an3mthlgm512vr26/mukiwetumenujax.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/gerebepetozagoxitobop.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/87970683372.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/govegedenugovubegabugur.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/xumotapotun.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/vapurovan.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/vaxuwoko.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5491762ca9610d1a936cba5ec55c8a6d/33388796414.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161259386ac366---12981941021.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029c664434---xovumajetebobumuxogumixup.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/52843583844.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/22565283553.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/3462003850.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f312bf0c54a.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/30378596042.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e43a11d08---voxove.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sivafin.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/zebugufarezewir.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb39d4a4c---xajik.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/427b8e3ee77767c82a13f78f9ec065f9/67956394680.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/14510961241.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cc978b02---nupejapegotajelufap.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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 11184 bytes
SHA-256: d52f7ce9489e99c446ee0a5136e88241b4907fd0557ed9a12ea285eb06bf9534
font_02_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 15436 bytes
SHA-256: 5d57125877171d4ac81b1273f23ddbfcfc4b37b74be1efaad117b26d48d43e6c

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