Malicious PDF — malware analysis report

Static analysis result for SHA-256 343a598f0a2e3258…

MALICIOUS

PDF

106.5 KB Created: 2021-09-07 13:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6915e255d0b50fc51cd1442de283cf0c SHA-1: 8d844c6527729d438f193849c47fca1f399345dd SHA-256: 343a598f0a2e3258502651ccc2d7034613fdddaa7fedc777948f9d8ff5a447b9
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing lure. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The PDF structure and embedded links suggest an attempt to trick users into downloading a secondary payload, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gagutp.com/sa_upload/userfiles/file/20210601204648.pdf In PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lugotovugufojake.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/giludisuje.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/gipogikesapenirelege.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160708222adedc---tukiwulowawupipovidu.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/zegelevidifedotixenokufam.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/81c2d67061b8ca17f5521b0f210eaa8f/99814204760.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/54632980628.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/mni4v47vn0tmifqqr7u5i7o8c8/boketomoseginaxuzidugeb.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/piligivobapazodoterog.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/79523565918.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/78569311982.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/wuzanudomevosi.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/53952093163.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8674ac289e29f680b563508776dd7c11/92227002172.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/57a387a39b23d3b1da5476901e938b87/nijovipexidojaranotu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030047522331.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db695e017e---wikikofedifubutidaramasa.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5758ea9fe---47075600221.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/reledasinujiwojebexas.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/89077931733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=history+of+migrant+workers+in+kerala+pdfPDF 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_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 17936 bytes
SHA-256: 95b04d05fda855a5866a0aa3cc7d92b09b8010bb2acc3e81a4ca0c0d7d68c78d
font_01_sfnt_off00016ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB4 11124 bytes
SHA-256: 4ad29185667be09b46f457e114da8990474761e595213897e0109af2dca41e92
font_02_sfnt_off00018487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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