Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6985352f37515ba…

MALICIOUS

PDF

93.7 KB Created: 2021-08-03 05:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6ee08769deffa39560138770d3f39f6 SHA-1: 5f80fc57daf43f8dea016d85a188c15c1bcca6ae SHA-256: f6985352f37515ba8ccd39cc22decd7480ac6138bdff78b9faa3b0a1e406b868
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 and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The embedded URLs likely serve to direct users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://luminex.pl/upload/file/navafulezoworugate.pdf In PDF document text
    • https://atamergranit.com/userfiles/file/sodexeduw.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jogogidadigidopebuf.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hlb4ip95572btuli9tceusqf04/83613214226.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/80240710624.pdfIn PDF document text
    • https://sinarwaja.com/account/files/80515253115.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4092faeb22---5105434381.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/369695f6c46978606f7a845b450ccd93/42803618230.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/c7b94iud9u76di20nv1f1g9om5/92561269763.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/burosef.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/begavisawa.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h7q74nsa1vj8ogp3e52es4lq44/dazaxifip.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/23383074759.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086323535de8---veworadinavopotolanitutu.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202181820242346.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1d4e8e0a67adef8ee7278fc0b260697c/19605883930.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6922271bc---kobafetawewefedefesusop.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511175709021.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/mitedasomisu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zigivefuboka.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/42108665864.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/59941376090.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/867d0dd70b1339bcd4b23a102b272e50/36535808902.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/melefigimomaxomipelokogo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/29a0ec9u2forqko101612s40t3/dinan.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077188fe114c---nekasasefifujuraraliledub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=history+of+mathematics+lecture+notes+pdfPDF 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_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 17740 bytes
SHA-256: 155851d4fdcc7a7d01e09f352373c163f87188b808672ad2a66e2abce75bb930
font_01_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C82 11092 bytes
SHA-256: 8f71681b878521a4f1c8f8ef6e6b11a33bf19d8e35b606657e754947dbb334c9

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