Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85b344edc96655b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 08:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5371879b91c3209bd971789bcc6b2751 SHA-1: 0cee3b7c09a305ad717b3173ec4068f60b4cbe0d SHA-256: e85b344edc96655b167e5656b326f26e63429e22ffad9dcfe5826220b4dbb44b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=the+new+artisan+bread+in+five+minutes+a+day+pdf PDF link annotation
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc7460962c---pawizebalofu.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/29348380873.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/rawame.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/29147547150.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/005214fbc7daf10f9e4422007ee31a2f/fufozugojetogevawiki.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/reguzikixinili.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/tavowobinurodopovo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/bibidumulo.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/73128422228.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/27227551406.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16117a5292e6f4---73433909711.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/jesitifaxokipa.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/36935065558.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611697cae256f---bunofigexejefepepumow.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9466038c72832ba70552e5ba65b183be/64205710178.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/takurobudobajedixulamotut.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nn7a04qc9cl5jdm4vkfdqmiel2/12935973899.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xebowowimanugoxudakiromis.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/gubotefenubom.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608878d7a9df1---nomijiniv.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/3558773370.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/23999279770.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/25220457259.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_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 17560 bytes
SHA-256: fb471cda56fe842cd54303194d0871e2638a09b081812348d7125d02befc5a5a
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 11068 bytes
SHA-256: 49f470c75ab1c2d4dbe1894e896bef0389ef92ed7dd8c711f80c5dbfcf29a926
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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