Malicious PDF — malware analysis report

Static analysis result for SHA-256 50247ccfc039265d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 02:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c0077d33d494c6da3eb7ed37bb1416d3 SHA-1: 8e7b79c430a57aab9eb1ac11d85cf0d02ee5baaa SHA-256: 50247ccfc039265d34a109401f87f7f1359ed86f3ad3d4e65b43ef01cb69552d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175d31b938---bowelanozepanitavupebu.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/14273165075.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/90307102395.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/80611079314.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/35507442020.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ffkb02vd0hvgdhmgo01qtteiq7/82571649244.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446279c587---nogududopefifibunib.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea072e3a21---kepaxolomukeromokawanek.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb9875a74---jadulozinefaw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3637e9febe---weboroxa.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/6999261633.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/24/file/52476257959.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd6d7862c---nokevajolorej.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/pegiseviwepaviw.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/43080869134.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lalupitefalole.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/146894b26d87af4145ea15f3bf419df2/48902299519.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/fajivulinusurola.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/kutugemogukudasazut.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zepurixerofim.pdfIn PDF document text
    • http://chinalabware.es/d/files/47606812513.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rut2i4h1r2t8r20e42b90eh3an/gifudipomozow.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2357934d00---dowogefetuno.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae1a84a11---litut.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/12362378299.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc59885e2271f5f5273b44943ae1be14/20781426101.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/72d606d0a32c031480bf0d555c7e25f0/juzafurelodukuzukusipur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fce+sample+exam+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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 18040 bytes
SHA-256: 7103e6c025b0c3b675ae054278c455036453775bbe65bdeabe3018d31a9d2d59
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 10344 bytes
SHA-256: c823b7e9757c22b8f864cd61853bfd061c47f9abfe9a8e448dc425b4f2f2f917
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1