Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0ecb70870b5d0f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 14:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6834d488d25860d1bc442c27ad461012 SHA-1: 75702a572ef4fa31d43055eb9e092f7529590272 SHA-256: 7a0ecb70870b5d0fb1b734678a6b6add1e1d763470f709f2f91780ec093461c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://szwygs.com/upload/zomuwizokomosodiwudab.pdf In PDF document text
    • http://vit-physio.de/file/14858526196.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/19113731307.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/22931219418.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455784a40b4---kupilemeguxewid.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xuzavurax.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/verirodag.pdfIn PDF document text
    • https://apra.pl/files/file/davopikigozorumal.pdfIn PDF document text
    • http://novichiha.ru/pic/file/86707756394.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbeb1108b2---68924467398.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/kabegekoperu.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pumorijirideni.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/seminib.pdfIn PDF document text
    • http://lobi.md/userfiles/file/95892131704.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/12014851927.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/volixoroguvixexaxili.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/63457133896.pdfIn PDF document text
    • https://novitas.ro/files/15712795452.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/rigobufiteronufurutobis.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f28e666be---betiwujunoxojo.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bipawidofemefemufepawefu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d414415794---23264258395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vortex+gta+5+free+playPDF 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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 17868 bytes
SHA-256: 6d0a5caf2c92866fd368297f8538bf69521cd37773212a4577cbd7052a3cdf78
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10488 bytes
SHA-256: 838d3eabf9c8d4a71585390b302ab546dbd2a44b9b56363d6cc15e8a5ff98d6b
font_02_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1