Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede836c1adaadac8…

MALICIOUS

PDF

84.4 KB Created: 2021-07-31 02:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec39b96ac8c009bcd9a02c85b1ac5d4d SHA-1: 1c784dfe1d7d6c15f0b2c98f4bb718d70448640f SHA-256: ede836c1adaadac849d0790b6b7391cf7b3fc3c5f7f2bed3f6d28fdd26385cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+construct+a+grouped+frequency+table PDF link annotation
    • http://ibconsulting.it/userfiles/files/farikexumijuwemefexo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef6f94af61f1d8cef3a15ee53cc6534d/funotom.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d793fdf299b46a4ab455bef2ef85c697/xukuwupixanuror.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/1je8073l8fepv5eqgmrecqil9t/navisu.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/63863381354.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8be5137a676eb60ed3db7f56a841cf23/90778919903.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/68545744097.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f205245f79---13415999593.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4065d25f74a3e77a8d86a02f87cced20/nabuluberaxalanupiga.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/67101401879.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/fakarekokulaxozijemem.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf12b9e439---96635839814.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ed2ac5ed86c6025309e21389504528bb/jazep.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/69566013553.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/46550931390.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/24873662717.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/rolukawikejiragofejifekif.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/66f60e08d92a9f51aa8ccf70a9782ded/dozakivave.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/maxusewadidogunoroka.pdfIn PDF document text
    • http://ombs.ru/uploads/files/ligipatimasimaker.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/s0crol5njqbrhhe9qi62gbjep1/pemoxazoxilajasewepef.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 17588 bytes
SHA-256: 483623fe3b71c250b466507dc7a3d5251e8cf0e596760c6911b67c700c629ced
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 11280 bytes
SHA-256: 5af1e9f2c06e7376db9b2365d41e64a4693f12525ea232ac32e80d061a9d7c98

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