Malicious PDF — malware analysis report

Static analysis result for SHA-256 7919ee5bf597c8a0…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 19:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58d44c854581f4de54a3f87176bfff1f SHA-1: 8646b6910806396605720895bd00f48960366a96 SHA-256: 7919ee5bf597c8a087572b8f9ed29a893b491c4ed91f8780ea5d4ee8529a1303
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious or phishing content. The embedded JavaScript likely serves to download or redirect the user to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d4015318eb9411906d2e1cea753d0073/53226412126.pdf In PDF document text
    • https://kildevangen.dk/files/68484043895.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6b1f2829---dalejelifikonutaw.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/58238983848.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/66538306653.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30789e511---20860755515.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/bomisulivorivafirol.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be83135ced8---16879170864.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/45017a41ed6abdf8332572df37abce09/57798894097.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/kadile.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d3f5966fb6b5ab8adb57424d96374f84/widosawulat.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m4434jcn30rdhruh1g3lujb928/58262360623.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079b37e5297d---73469444762.pdfIn PDF document text
    • https://wita.lt/images/files/7448959612.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af5e452dd294b381a2d82a8b4bc9f8d0/tobawuj.pdfIn PDF document text
    • https://area5srl.it/file/64487916132.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/85555656270.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8832e0cb19bb28eb8a89ed9c37ca2381/ruxanazitibezoda.pdfIn PDF document text
    • https://tomas-music.com/contents//files/45418286200.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0nmpk9cdu725u2pl3kmlohmih5/36344876937.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28g5nmh7jmrlndkgg9422ie025/wemigatedagevirodeku.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/luludanikobiwojatobim.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fijigafejinef.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b68b07d83b6bb289fe958b8ab5f9a5e5/56202151113.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6dc7631f25122e222d0ef9957d78966c/13338667510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=doing+phd+without+mastersPDF 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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10980 bytes
SHA-256: 5d599f375fe64bec600c445ca61c374fee219fd8b63bf369cb396ad04525d544
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 16724 bytes
SHA-256: b211521a19a67c8579b1cea9c969d008c48e3f7190d6e5632555eb8501844a5f
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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