Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b67a0cde1b2da2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 03:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a56386aeef7bc9efcc77f80a95f29d32 SHA-1: d734f32ac297ecbe636507507cd4adc5343215d2 SHA-256: 99b67a0cde1b2da2c0c72077608c8ba51b861a7809756c4f982ce03c049ff68c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading an archive, possibly by providing password instructions, which is a common tactic to bypass gateway scanning. No scripts were extracted, but the presence of external URIs and the link farm structure indicates a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://crysiq.ru/uplcv?utm_term=como+actualizar+el+android+de+una+tablet PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2851a61f0044dde974cde8f9bd094da6/7361807877.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20298569746.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/riwafomu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fac40138bb---kobemomulowez.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210901122228_888691524.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/3653641723.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/18191624668.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/tuxevuvaz.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/gosotadapuvafalifikudem.pdfIn PDF document text
    • https://fultoys.com/userfiles/sebux.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613669704bc75---mibojomewofodo.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/meredasuropezikel.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tozojuvimot.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f19be6b909---wiguvojodezejikomujoxefim.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/40335290365.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/28421017195.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/nojulefevo.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/wumagujo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161383d6f9fc5f---4912801323.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/51382681295.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/larudozo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613190f09049a---levilusewenojagogataxudub.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/viwafujuminukoja.pdfIn PDF document text
    • 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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10692 bytes
SHA-256: 5a26d8d8a55d42fe78a82986581bd8c7714341a43f99757f559fc8e76a32c053
font_02_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 18468 bytes
SHA-256: 2e1811f44e89d1a3b14df5b5066aa04e2322a2cec9c1427874c230d58cbef1f3