Malicious PDF — malware analysis report

Static analysis result for SHA-256 9608336128f55086…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 16:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 536cde4ea967a6533ce2fbbd5049cc79 SHA-1: 7da8a7b47b285f94bcc099679aaba0d7be9dda2d SHA-256: 9608336128f550865da61c533932ddfe561bc42fc4e953eedb6dd90c6613c80b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee09023d6e88738d0f7166d53e971325/zijuzuf.pdf In PDF document text
    • https://mauspro.net/upload/files/tutibumaduf.pdfIn PDF document text
    • http://haphadoor.com/upload/files/numovodeza.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/30885566619.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4eedf8a5e749a872cd25f3eff2f6be25/19656379580.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xavowikatimo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vukujetosekedamefanomef.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fc0829960---tusubes.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/61061567480.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/nofimopunaradajiwaw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6cc93bd3---39101515924.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/tufes.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210830194712.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/51022441847.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606d059b85804---56294715904.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/67241334533.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3f3bc186c473fb6bfbec413e483d95a0/48221285517.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/034dcf3aa4b428b3e977e035b74b31e9/61849785434.pdfIn PDF document text
    • http://chinalabware.net/d/files/xowebusan.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/32812018093.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/49122776739.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/73097635460.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=english+dish+bubble+and+squeakPDF 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_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 17828 bytes
SHA-256: f6063df57079ba1fdd35e0555fe94006725232a1aeef3b7af975a66c7518f089
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 10672 bytes
SHA-256: eaf0040a0a5a8061ad157e12e1b1a2846fbe4a9c916eda4e2bfabd584ef2e11b

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