Malicious PDF — malware analysis report

Static analysis result for SHA-256 11520eee3d35d3da…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 07:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 170e814991ff5fca3cd9e3986abe6cb3 SHA-1: ac886e946ce959dbc3d5f89421186fdffa231748 SHA-256: 11520eee3d35d3da84eea072b1b5c7fc375d64fefb7aa111ebaa3f0ce49f7749
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b17a9eeb4841b7675d9079f34a62a120/dawej.pdf In PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/35371612809.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/waxaziwevegila.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lupeludujawavekipalisejib.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec20e0f383---61552926279.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/teladikajupirevifum.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/xufelovagofu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/apmsi8b8n1t0lrjgmm1855pnfr/54620947445.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/57724552492.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/vumelonof.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3abe79f60---rumududobaleboxeguzemumu.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/xabonatomuvoxuwevizix.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbb115676---17045435957.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129e2404a87b---99462519615.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/43824203998.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7b3d2dd0---71679039202.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bukovemogefovexafimev.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/visiwibutujesanovatipuwa.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd40787cd---wujekifunokijebujifu.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/nuwegaribotiremaz.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d657e2d0d---1316586813.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb73a8fe1---28645943114.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/80036872735.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/dawawubuwuvotufogifamede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rock+and+roller+coaster+songPDF 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 17388 bytes
SHA-256: 79931ede16a3944a59ed22a8581e2b7f73c0c6f7fd9a750d734d27329b58b748
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 10588 bytes
SHA-256: 8d44a61b9f81a1698f12ab729df7a5918b63ce54965d64a526eb955104241c32
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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