Malicious PDF — malware analysis report

Static analysis result for SHA-256 db760f50309edcc5…

MALICIOUS

PDF

83.0 KB Created: 2021-06-30 01:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f7199309e4ffef14916709d588e36c1 SHA-1: fadaab6df3a1036246b96e65c20e7f0e4ccbd64f SHA-256: db760f50309edcc57d38efb0cf9fa739f7db9ce18d78d1547bbf78cbd1793227
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kildevangen.dk/files/53250560100.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/16697b01c378590b87b200d843a53b0b/zolumowutuf.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/903de972e29dd7f89fb8459dbce9fce6/16022421331.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f022920b1e---79315207962.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mjtgopf9bs09tqmgv4hl8pvrso/jilinapam.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27621de75---71696960737.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f16454266---60265437625.pdf
    • http://champaigncursillo.com/userfiles/file/78576909183.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9pgqopm1fpmdue289t73use7c1/zawifetunadok.pdf
    • http://tantusmarina.com/UserFiles/file/pavizovutolefebatu.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d214e4e3594---24619611603.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe3771789---naxonilo.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/23748764019.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/672ddd785b692cd71a8df1f1b641dbf8/tepejesurujojuzupupi.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7fc4216e311bf9eadb2566a8ce2914b9/zifonase.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16086f4b662ecd---tofapimigovegasujinex.pdf
    • https://ka-base.no/images_content/file/falakilet.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b5e3805c119d2d02165216eb09b7ef3c/juzotabowizovix.pdf
    • http://ellev.fr/upload/files/83324421201.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6baa3d465e9b3a6e37c2bf01fbfb1111/pixupalizoribavufekeneju.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071399a0cc62---kivoxabijerapufaxuwona.pdf
    • http://harchovyk.com/userfiles/file/kagiratajijararagej.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ffa8c67c---momaroj.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb43a21dac---90441472592.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=spring+hill+subdivision
    • 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_off0000dec4.bin
8a9355b1dc641040e985fafa49d1e07e333a6d2f846597ba1e9b4f5db69bc4f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 18552 bytes
font_01_sfnt_off00010f06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 16792 bytes
font_02_sfnt_off0001271d.bin
085ee130ea88741906686c7878c27e38eb08f6d39f7790603c00ac70a9b0898e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 10660 bytes