Malicious PDF — malware analysis report

Static analysis result for SHA-256 7684ce53495ece77…

MALICIOUS

PDF

73.6 KB Created: 2021-07-02 15:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d962cbd1f9851fc576ec0fd3a7493bf SHA-1: c13325ac9f2e604db389dcea7c71c24a06b5a32b SHA-256: 7684ce53495ece777b728f4d1882b47cf7e2a62e4505a764315f83dd0767a9de
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4862d2dd2fca12cfb14de628de8a379b/58636682149.pdf In PDF document text
    • http://yuhongzg.com/d/files/3018365677.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a2e14c74dda76b15be11df32730ab695/duvixagaxajurerofevepun.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee23764a5c---vafifu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b3393c04---pefon.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/68982312256.pdfIn PDF document text
    • http://france-ex.com/bijuj.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/b1vc93t2ehn4isagsb5d86omde/kiwoliro.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/47h53tmuqm3o7ruol0d4tq0229/dimumavonejofebawa.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/konurujefaxufogimabusazaj.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/r5ch9sevduh68rn0frm28gkk24/pinumepagidimijapigi.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d3e37f30---lopufod.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd00811d0a---dajoki.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/4601235834.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/da78a0d4ce76ece90202b6d346e256d3/15999568204.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/74639187934.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8e49ddb3f311cd85795e14e4e48befa3/sinasokawub.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be27a3f11---vomiwuxutatowejerusonodix.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/40785956888.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/minopinanijefutumamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=two+guys+pizza+hoursPDF 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_off0000befe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 10472 bytes
SHA-256: e65eeb29a4d6980cdab6c72e7f1dbeed9ca769add3bae0510c50e5ed51bce344
font_01_sfnt_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16496 bytes
SHA-256: 82340eb81e1a4638c360972da3e3da005b483ffde732bf7c281c1a83331c96d2

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