Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02426fb59475df4…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 15:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22440bf42dd5c509f3a9e84689024473 SHA-1: 930194568fa43c9dc16c389ad7d5a141beac175f SHA-256: f02426fb59475df47224c6fd4e159e95c84c86a697d28fddacb8592edb412cab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or to exploit vulnerabilities. The presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, strongly suggests a link farm or phishing campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

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.
  • 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 http://sk-massimo.com/js/upload/files/81396942196.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/pegenupar.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/keregotubuwofub.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/88982096012.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354e638b75---xasezipinanasapozozugofex.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ba0ee3ad---85502217842.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18541e719---37391335220.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/pugebativifozidomimubopeb.pdfIn PDF document text
    • https://norservis.cz/files/files/25832984058.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mewudimaliribojelabe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ff7cbd8dd3f92f20888ecab8726fd9f/xufaxibe.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0387d4b5fbc14f8cba382e37a09d78ea/94316308081.pdfIn PDF document text
    • http://sswjeans.com/files/17906712315.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/waxaguzuruwusarimusav.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/disuzalebojezid.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/goxexinibatotuvelosufi.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80690636455.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/34784871392.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lovexumisekinijega.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/nosomifirorene.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivaza.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wavekegoduvojafatob.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161355750cdff0---wubavajoloviruzufu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613508ac8309d---zisopovitenag.pdfIn PDF document text
    • https://mavibusiness.it/file/53333629050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bird+recognition+app+androidPDF 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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 17732 bytes
SHA-256: 6c73b4bc29dc576d642e59af94c8cdade9a8c7413020bba98632203338e59c8a
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 10528 bytes
SHA-256: 490118339b572b25f2433ed2d38b1f721f9d73bb504f13eceabe6fe1479b1f70

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