Malicious PDF — malware analysis report

Static analysis result for SHA-256 71318f6020409a3b…

MALICIOUS

PDF

77.5 KB Created: 2021-10-05 10:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3cf72d6ae6bd93145ea2fee9b3427d81 SHA-1: ca7cc3f9c9810feeafe38404c30befe2e8720e42 SHA-256: 71318f6020409a3b16802254c866ddd4c4e2a11476fc4647856bf061c9b8ebc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=electric+field+due+to+dipole+at+any+general+point PDF link annotation
    • http://fpempresa.cen.es/userfiles/files/85806045103.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/tixifizasubol.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/63867299382.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16153e519f2979---65221290799.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/mizifopuzokenofuxuf.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/61041701259.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16144939fce141---tozemari.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/norotasufogari.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/badofirap.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xigexazise.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/68626711452.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/wosapedigigule.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/34489792810.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/68054198382.pdfIn PDF document text
    • http://bienbao.net/uploads/files/viwefakexosij.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/64145040291.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vujunosefinovelepugokodet.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/rizekatibuzome.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vaniwenifaranaba.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/41186945661.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/jekud.pdfIn PDF document text
    • https://upaspor.com/resimler/files/petimopesorakufe.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/giwisalirofuxefabu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6da8ccdb---60352962211.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161466051f2f70---nonafozuj.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155ee782c223---62722534542.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_off0000c269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC269 10824 bytes
SHA-256: c4554c195896875160c6c2872f9e95d3ea6a64acaad8426d9a0521481ad54b53
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 19380 bytes
SHA-256: b9ac35790b8920a09afb1880bf5e542bcad5368d01dbe4e13856e7e705e7c108
font_02_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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