Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7be99e2b8f6df6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 11:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afc2027c477d49c68614fcb2e7294d2c SHA-1: 21824a4a8c142c9c4b2e13f9a27b237d75a83cc9 SHA-256: ea7be99e2b8f6df648005d3eacfcdfcf38090602fb394d725b320434940ba31b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://netinflux.net/userfiles/file/79908460709.pdf In PDF document text
    • http://chatfieldfarms101.com/userimages/89953669686.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dokesezuwejiko.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/85110329180.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070410c3d30b---61482489051.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/95880876313.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zarameludavakavodu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/94062756761.pdfIn PDF document text
    • https://comfort8889.com/upload/files/lumaviseminedafazej.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2001507d---vepabilitivepe.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/janumevofeb.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e23add8e1644e500f29f26166221e7a9/lufelotozaliduzupubojapa.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/65232421136.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/rofitasunolalubowaj.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k7i6hsrmjprhjauhfv7i3fa797/41918908759.pdfIn PDF document text
    • https://isosklo.cz./uploads/fopedosojatupitasi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16083a56fe3227---813608893.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///82836752553.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ee42a877fd1471181d0f4c34d71a9234/9354076192.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/c25264ce8188ca877a0b22c16b6684ca.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f20b701c---rezolabazulamig.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/14308388661.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4f75daca1efd0865b5812c7979df821a/22157034181.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/93c0487a8a0c74f4bd3a7014e307a7eb/jibabubugotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=blue+cross+billing+manualPDF 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 17632 bytes
SHA-256: 93535df05c762f573850877df6a141a55d42f0fd9c4dbb2ce38355a528b1d87b
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 10768 bytes
SHA-256: fcb49e71a288954b87e986ffa472ceeb5710a9cbadf09690570e656822692914
font_02_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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