Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3039f57c1c4b50…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 17:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59046d9b44ddc7d6e29c30e85ed41c48 SHA-1: 4d2daa6f492cce4095c1a9598a90ae47235b00f4 SHA-256: 5e3039f57c1c4b5088885758ad03a4cab61a524c6e05341866e59ef40ab77031
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. This suggests the document is designed to lure users to these compromised hosts, potentially to download further malicious content or engage in phishing activities. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc600b8614---49427353429.pdf
    • http://improntediteatro.it/userfiles/files/zomikojanisim.pdf
    • http://pantryscan.com/123cars/imagefck/file/83198089549.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa36c06f32---zexogi.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/vojetuzosudedunekip.pdf
    • https://soft-print.pl/app/webroot/media/files/25123699360.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0a7cd582---82131272268.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/cfa295c5129b51fd3b65b208c01ac825/20750176511.pdf
    • http://nextlab-semi.com/files/fckeditor/file/kidagozox.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/97883320131.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k1amg0q4398h3ibhg0081v4eu4/felopuwapav.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/magefenuz.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fe5b8c6de28b92bc6576e67e700847ab/xuwobeb.pdf
    • http://hebakotb.net/userfiles/file/vezexameruzatezoposivi.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6c683d916f482265f5fdfb45fe3ef608/netofimil.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/tibutetomegedegawud.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/54860308507.pdf
    • https://bettyloupaints.com/userfiles/files/72598759476.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ipir7j8mpoakvde0ts13h76qo/genemejawutigu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5110bad6454f74c03866b43da35d5094/gusomuxotibopojexo.pdf
    • https://mollis.rs//files/rixozefede.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/nebamamonodukekazemozowug.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/83675391102.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7075afdb---vunegifaturinimewod.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa2194b84---70071054300.pdf
    • https://feng-shuiworld.com/userfiles/file/rofifuwi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=intensity+of+sound+definition+in+physics
    • 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_off0000e72a.bin
924231a0dd984f9eb18d370000e802443381eed9b00f0e284aed1f31e61a6199
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 10576 bytes
font_01_sfnt_off0000ff49.bin
df79e17b3ac0ff999a4c53ec37a1a40881f020cb82fb0b36e1d7d2f29a15486c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 18080 bytes
font_02_sfnt_off00012e3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 16792 bytes