Malicious PDF — malware analysis report

Static analysis result for SHA-256 8500f2b27c360e4e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 19:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de252e87366ef0f1024e275e9b658b28 SHA-1: 9f7efef1533d59d443a0ea32876a7fc3468f433b SHA-256: 8500f2b27c360e4e55a0c3337f4400b84fcfe898cf5cc57605aa089c95e4e674
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely to redirect users to phishing sites or download further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=crazy+rich+asians+full+movie+eng+sub
    • http://bluekeydigital.com/images/pic/file/fotes.pdf
    • http://alltechsro.cz/files/9658267849.pdf
    • https://servicepapik.ro/files/pelasixijeresamipo.pdf
    • https://alaqart.atelierleuthold.ch/userfiles/files/fixila.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb28e9f8d7---34947397925.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3n2sd66d0c4clnh8m7inb088p8/73715398794.pdf
    • https://bangvetthuong.com/luutru/files/594316304.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/vesad.pdf
    • http://rowadhr.com/app/webroot/upload/files/nexefusukodalesiba.pdf
    • http://pharmorgsyn.com/upload/files/80996378714.pdf
    • http://suvagcentr.ru/userfiles/files/49205129967.pdf
    • https://sistemagestiondpr.co/userfiles/file/gofovatukuwesubapig.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/bilulodawuxurubago.pdf
    • http://torgoborud.org/images/file/govomesefafuwuzewoma.pdf
    • https://ovistar-dz.com/ckfinder/userfiles/files/21497767289.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94face464---80815236058.pdf
    • http://susutour.com/userfile/file/jupimilobuvoragewavunirod.pdf
    • https://ceylanotel.com/firma/files/lifuninaxobotikukirew.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210907_756AB505E8142609.pdf
    • http://tipiland.net/upload/file/xifagezufafegisaziga.pdf
    • http://gruppocreta.com/userfiles/files/90992320761.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/86d3105db9fc0159c08c330617c164fe/56110545082.pdf
    • http://xn--80aamwn.xn--p1ai/userfiles/file/97064379118.pdf
    • https://la-klamm.org/userfiles/file/72781119212.pdf
    • http://espicycooking.com/files/file///2707518462.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b636.bin
3f8bcf785059ce41ba71df11bad3fe54dfc1bd2c683f987ff6a476d3e8a07c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB636 11196 bytes
font_01_sfnt_off0000d053.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 16792 bytes
font_02_sfnt_off0000e865.bin
5cdb3a1bd09bb19e6dd0a1a1e9f34fb98ff84b4fa2b147b44f5ebb35a48fd32b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 16948 bytes

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