Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a11babdaf6360b5…

MALICIOUS

PDF

95.0 KB Created: 2021-07-21 22:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 241e37f9f3002b8e384922862201fa4f SHA-1: 96c4232c30dedead26bc263627c34bf0ec2aa286 SHA-256: 9a11babdaf6360b552115328edf70113c6892dcd62da003749e9a21351bef506
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves luring users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://vmkmsz.hu/userfiles/file/sanowoledazorob.pdf In PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079589cb79dd---57824030128.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r0f0n5vn6lbhojillnvs8ndnpd/zidofuzuxofinubewemurizo.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27980741289.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15234616228.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce317c441---81688447966.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/11439131458.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/lelofasuvifulisurukiti.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/78983268107.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/99626862515.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a456f447ee2---72061081509.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b01100e948a3a547559fcac749c2a4c6/vupujaturor.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/plg24i6s79n5ucv3r6lsfrmurg/341056734.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/gikokoluduvumagexiral.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/9709173002.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/rigerikesus.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c494956d115---75537031338.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec2825678---bawopagidigesuvuz.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/xunago.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/70563874186.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/205466d660d1906707c88ded966155eb/6175530334.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/34365978757.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa5ab94f3---5953910472.pdfIn PDF document text
    • https://citytrafik.nu/images/file/wigubififubigeredonaxolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bible+verse+approach+the+throne+with+confidencePDF 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_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 11064 bytes
SHA-256: e184d8ac99e11511faf7563d8cdd5973764e0161b4b3e8e22292cd9ca3945396
font_01_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 16936 bytes
SHA-256: eec18c5bdf32db71ed85be41af1763c48154433ab60d52ee6de380a523d8470b
font_02_sfnt_off00015557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1