Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8788c188f52a64…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 01:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 674a46ce5016cb139550766166de60f5 SHA-1: ad1f3cefcb69e100d4dcdbf84efce1157dec3327 SHA-256: bc8788c188f52a64699868d8fa628f73b31e9fa292b937eff97edaa2d4a39d60
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious files. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=hofstede%27s+framework+for+assessing+culture+pdf PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160797c8e96491---56947014943.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc033179eab---66825969502.pdfIn PDF document text
    • http://brlairport.com/images/file/rivojifowamunozokobuxim.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8d54fb74---82849698034.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0ngg17qprhcer5s9ni48ogo9a0/wisuken.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d298f96e11e---rogipebo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fe4c4a31---tulosubawevajizasowu.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/sitedadep.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c45f9a0ae---fufagixi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f2babfbc---vodexifakojugabem.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vonobezimajakadulutewas.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zudafajupisiwiworeturefi.pdfIn PDF document text
    • https://tavio.ru/files/file/limenoburuvopip.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/jisigidijali.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/devewedoxokikowigifikik.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d22261341---nosivifizejubatad.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/94a156615f5b6be4081c18ef7ebb4311/49493090673.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/rapos.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/aqofb4ejrj5mlqfg172210tmq0/duwevemajasudoj.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210630044914.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052205084910.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/dogupe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d12dee418---sifiduz.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/u8kn20ot3tcou0019sdcp4hvbr/salezapewusovetu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e13cd17dd---pufav.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c4e7ab575---16372261411.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/18364642641.pdfIn PDF document text
    • https://kaimano.it/file/40273132517.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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 18616 bytes
SHA-256: e1e8eb917878c6ff6ea06a9982cfe7e4362197f2ca6f1cdbb84dcdcbab61fa04
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 11268 bytes
SHA-256: 79d970aba52e8a9e0dd6497b72665c0ba17034f70a524e9e451d370f843ad4cc

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