Malicious PDF — malware analysis report

Static analysis result for SHA-256 776c14cc94d9dfb0…

MALICIOUS

PDF

81.3 KB Created: 2021-07-18 12:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9446e36c96328c1b3935ff8d24971b07 SHA-1: e8a9491e2bb2e5a987d81e2b24024f598c2f9ab0 SHA-256: 776c14cc94d9dfb011910c9c25110c1f68302a3b2bb70c3b79ac946ae51196f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://conblocmanado.com/pics/file/pofukinageduke.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/vuziwedoduxivuf.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/36275253631.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d548264ce18e0d912c162bf3cd4aeb0e/mupelawunuxuvawibude.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609403de5dd2b---53040352676.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/wujikuvidobawov.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa2e816e0---dujoremaret.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/17311201905.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bnbhibeujahp7e1r6mtpssgokc/tefebetatujodajaget.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/gupixowubotaka.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/38968130469.pdfIn PDF document text
    • https://marosme.ro/hirek/file/visoduwemododusetid.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/dulimojimekemorasiweme.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/61854098500.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/21725104223.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/75615668577.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243bcb7f3f---33868324655.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lufuzulilenifofol.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/506c9910c1e8ca81c223659c984827af/mevakegerojupepepekuri.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/1368723316.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/jezoraraketededamesataxo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/mufoja.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pcqj2d88hr0ljeb8lfdp316eqf/xukivikefitawe.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/19167758015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=parallel+intersecting+and+perpendicular+lines+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c4c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC4C7 17144 bytes
SHA-256: 4fbf869410f9127585b3b8c34165db1a81b7af2ea6f3b75733fe2c271b41b9f1
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 11072 bytes
SHA-256: 7283b5c92dc031a355a986248f6db10ecc07e75aabfcde8a94d338f0e0adee49
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 8924 bytes
SHA-256: c2afe38b89c52b31e3bc6a84448e218cb17a7c329faa1782b7344e8c76fccbb0