Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4f004b136a558d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 00:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d79de09224f81ee1feefbaf9827be772 SHA-1: fe6305cd5d30f36c402a7f69b4cc22796c3126ea SHA-256: 5a4f004b136a558d549991cada20986fcfcda3841adc5b4eeecf9f0cdce79cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=invertebrates+worksheet+ks2 PDF link annotation
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/78afe93ba83190b625e24d6b37e854d3/61537195001.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/75977065195.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/28/file/20210728_013541_199.pdfIn PDF document text
    • https://ghnservizi.com/file/48008166752.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7fb68d02---15738541477.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pe16ib37obubjh2m029eheehsl/pineges.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fatitakaxig.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/xigaxe.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210901205509_1371145375.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086da417c03---vubebepiganixatuzevoto.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/werelekazox.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/14636517121.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d433c47f389---furunerelanu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/k63abol42ase8keu4etlb4op30/50677771860.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/4922585185.pdfIn PDF document text
    • http://hkacca.com/userfiles/nomelidi.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/23820487120.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/81632062858.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/31ecd0909a735bf41f868326cf4e9091/96860998283.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/ruzefavoga.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/17960351998.pdfIn PDF document text
    • http://mosjob.ru/images/file/ruvipijejiz.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/95150493376.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/rorekolaputebafekuteris.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 10524 bytes
SHA-256: ac4db8734d3d82b8cf15a3a3e584ea6423f0c50840d12e265974ba09771c585e
font_02_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 15840 bytes
SHA-256: 04945a73c01df8487df4ba30c26e086f67ee0ebec9b225c6145b10581256fdf5

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