Malicious PDF — malware analysis report

Static analysis result for SHA-256 8852991cdcd36d01…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f49755aacefd8fe40e10a32a63b31e26 SHA-1: 8d692f22dd990736803a0a6e654501d2f142c2f5 SHA-256: 8852991cdcd36d01be6d1e26e7ccfa5098383ce1f092f06bfefecbd3027720c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links host other PDFs, suggesting a chain of malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136428ef084d---44471417084.pdf In PDF document text
    • http://travellightnepal.com/userfiles/file/90172033384.pdfIn PDF document text
    • http://knipia.com/userfiles/file/81483226589.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/11562249958.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xamelidama.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8d34ec34---69256707123.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/zasolupitegedubadel.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/35848065821.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/topawofabevagituwitonisaf.pdfIn PDF document text
    • https://eetravel.net/file/59560164338.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/82521265386.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/sopafiridodenabapipivubiz.pdfIn PDF document text
    • https://bloc-immo.com/images/tupusaxaro.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/novawuki.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/12035343064.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f820d9e71e---77477310674.pdfIn PDF document text
    • http://topp.pl/_topp/file/42854907946.pdfIn PDF document text
    • http://simoncaulkin.com/images/102620440.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/temudofazawa.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/47379516221.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c0c1b5d2---vakorifejofejurafinabanot.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/42976079194.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/daxas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=yellow+wallpaper+hd+for+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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 10396 bytes
SHA-256: 1497a4a0feab203050dedeabae291094961c579a88652323b8070a07e4dd1c72
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 17196 bytes
SHA-256: 08414bc6434f6bf98f3979fe0057c648128161aa65fa1409ea2369e9c76d30e4
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1