Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fd23c36e731130…

MALICIOUS

PDF

71.8 KB Created: 2021-08-08 03:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da16ebf0738440bb1950a10276821a90 SHA-1: fdf5bbe527a7bc0019cfa6ed83ae1f572535ab83 SHA-256: e4fd23c36e7311305e4657a47ccf1c7b64e489d223366485842c67b16fbee748
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://obasekiestates.com/UserFiles/file/13708133120.pdf In PDF document text
    • http://asr-net.ru/uploads/files/71057655139.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4087197b---rosadatinijumuxeketikera.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/niruvenonewupunowu.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/2674803663.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210609035754_tncf1f.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/80362600519.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/65511299253.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d528cb5e9---morawijubakixezuwifija.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/solekegulowimo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/52667dc993c8e92bf1408fa4e365dd77/fuduvikanodirusuvolo.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/96293987764.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/06j474mpibh1n5jugm7n08v2l4/16733268259.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafc60e268---xewilofakemanufunix.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/23528765323.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9a02139f6e3ae761041d222039c0bf45/24810083542.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/18731208339.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7a4ac4f2866173e0e6e0a4b2ace859d/kuwimoserelikikurefotu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c140ddd9755---wixizomafinokenawikaxibug.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nudefizegawokibipijodili.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/40114550019.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ge63eu8jc136dq45rvnb3f7eh7/38704997370.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/tiselo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954448b366b---90006640091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+can+i+reset+my+assurance+wireless+voicemail+passwordPDF 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_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 11032 bytes
SHA-256: a9294f72b40dfda762f907720df0e458ca90372236b7f8cabc9ae11c1a13e7c7
font_02_sfnt_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 15416 bytes
SHA-256: 97dc4aad0d476633973e01068e717757dca348c99bd9508b66add05ab15fafda

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