Malicious PDF — malware analysis report

Static analysis result for SHA-256 4093fa24ea1a41af…

MALICIOUS

PDF

81.3 KB Created: 2021-08-17 22:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a7511077bcdaf128a0e7f52f65bb401 SHA-1: c283bb38dabda9aaeee2fc55cd930b0ecefa8fae SHA-256: 4093fa24ea1a41afa7cc53b42494028c7bbc8ced038ffd38791d45ed0234902b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=how+to+assemble+a+bestway+pool PDF link annotation
    • https://champion-osk.pl/userfiles/file/57565424005.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/moloron.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b906de37ad2---tepijeli.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/tolijalum.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/77603003651.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/vasir.pdfIn PDF document text
    • http://jarosi.hu/files/file/7271471498.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76dc3fb88---76021986394.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/bifogiwe.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a1673a361fc7f6ba8a9bf08f91e9c0a/99697758819.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/seletibawu.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/57340948647.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e2758a4d---faporuw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lujevulazesif.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/82287170991.pdfIn PDF document text
    • https://preciseenergygroup.com/media/mogonid.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gilit.pdfIn PDF document text
    • http://aimic.com/userfiles/file/11428910829.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda538f421---11433891360.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/269dd7049df98d232d2e4cef56f58966/1738484874.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2beed97cd---zuvevozerokuvokedetinag.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/h8agkn4q63if7hk7rrmp55fg15/41868960020.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zaselekanodutigabozogara.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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 16356 bytes
SHA-256: c0fa6033d074e4acf0bcf8c6bd529b641042ced72ef5d52c86cdde52921fdca7
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10448 bytes
SHA-256: 27e149d0c8a0f9682df4215d123b4ddfa79e028cb08b77b4ba18532fb1f6b990
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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