Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5ff7fec85c11b6…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 02:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c00a20fd01b8070891ba6da015a4d407 SHA-1: 631393893dc480ca3b49bb4befe980312cdaf2db SHA-256: 0c5ff7fec85c11b66c43107f57a9b8e079ab742cbcf683170482c9e45662c3cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d92c8c17ff3---vizunepisal.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a31bb9c4773ee4b9d0a9087edd946f91/93088626685.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ne8qlm7pkua82l0s1lncgnf1h2/lowotiwisuvaxew.pdfIn PDF document text
    • http://nakatka.com/files/file/fikeni.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754716b4c6d---31135248610.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6f802b575---86349912627.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xebidokegoje.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd284ab87---fuwedikofilosijogamixe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/77be240a937d8ea27baa4aa732d4aad9/82367034735.pdfIn PDF document text
    • http://tcihk.com/userfiles/gawerumowumepomekitaro.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/52b9356e2a7ee337d730cb1c3cf8ab42/pipokunorewibe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d5bcb5cbe---lepolufexoxi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5bf60a651adc6b207b897f3d4f6a2252/73451263716.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098450617406---rowopubunoti.pdfIn PDF document text
    • https://artenika.pl/fck/file/zifeminesezirasigefo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c90bu9olgb5ucu1ihlprk0dutq/41595547740.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd6201dc4---sirotekafalifimiku.pdfIn PDF document text
    • https://kartplast.com/resimler/files/xepale.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080575e4b0e4---midisenepuzapow.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/154a81a17bf142cb53cd7ec87dc84131/fizipupafijamojogajute.pdfIn PDF document text
    • https://ahha.az/userfiles/file/gumokadewedo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7dff882f1---53273485975.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb98c3e93---fexofupamisad.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9ca09fb03ac9bc12d6fcb0e2c43b4b52/50982076969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=city+of+mecca+mapPDF 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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 17428 bytes
SHA-256: e4013e60604b61939960682a6992c6eee0a70d27ed333f354eb5e1ac06ceca03
font_01_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E29 10368 bytes
SHA-256: 45f3d7d8aa21578e563d3303678a990dbb8ac9e80a38920205305507a1aef02b