Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc680bd27a1aff6a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 07:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ef91aeff14be9a27fd39f67a258adca SHA-1: b47c56734f81dd993a0337c40ea84c44db17e56f SHA-256: dc680bd27a1aff6a9509f3a4533e0ed25e4b99988122524a898ef03bbc6cb7c9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=android+objectanimator+xml PDF link annotation
    • https://jairdefreitas.com/ckfinder/userfiles/files/68679561980.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/nosanokogodatajupolu.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/95912431385.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132785edf8e8---wisivemuxesurekota.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/fosubobo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/53855139494.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nolilava.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db530a8187---jopotuxaperilumuxin.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614478272950c---10508406975.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/xuwexikikewepejo.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/gemusolijotobulowulozita.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/mevowimewowomedut.pdfIn PDF document text
    • http://mylodge-naoshima.com/susojife.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/figufedewirev.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/91444421363.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/16421540836.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/21874123405.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1619001d---61052580070.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1f4ef42f975437b7b6afb918dd67f316/34221309276.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/76937234894.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numabijivixabir.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/17441613812.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/39695942215.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/tivugalitozugati.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kipureze.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/malul.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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 17248 bytes
SHA-256: c321b805b62ba67d02211d12c198df0792c733d182a37e10cc08aba04ccf011d
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 10716 bytes
SHA-256: fb0a6ce6fe78c871886cb719123a092efde1fb0de60685fa59676a61a76d1095
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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