Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4403b2074bdc76…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 03:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92c0a48b0f7ab918f483ce8e6e12ed16 SHA-1: 48a6a2fb2a06f9a88117789a9ad17706c03fa7ba SHA-256: ed4403b2074bdc768a09ac141d55cbb293e0c0ab34e17b49541b5e4340402aec
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a visual download button lure and numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to trick users into downloading malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeb396ed0---78895574331.pdf
    • http://bscartridge.com/pic/3653836830.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/762a62b0586721926a4ccb5412a4eb68/gakemebotawudow.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/696427a0893df22ff2237a6d9b52a88c/44954950010.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c2904431---dabogolukamive.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/xalodigase.pdf
    • http://hanleyresources.com/images/megalakofopekigeji.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf1c8cffd---48508261449.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab191ee078---pitutigovika.pdf
    • http://unsersohn.ch/images/file/45454690533.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607393d4528e0---wasogazovalo.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de6a86788---xikoven.pdf
    • http://veraschwemmle.de/fckdata/file/nevaxojizatanow.pdf
    • https://maconlux.lu/userfiles/files/4112325492.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9993dbecf---wenibuli.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f632134c17f334ba68262a7f8f7a61f4/87934260327.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/nbc8vtju8df44h2c431kqtvha5/64676126111.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/816ef91f758f6a3bfba5115b2348da02/47398025380.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cc4c879927d43b16fdc188e9790954f1/7459051244.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f88fb48acb---kimuxiwoxos.pdf
    • http://maility.pl/_ADRESuserfiles/file/zurivumus.pdf
    • https://isleo.com/i_photos/file/bowimubasuvoturi.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b7616bd5ac4---51009264700.pdf
    • http://www.cerathai.com/image/upload/File/pezexoridejed.pdf
    • http://guides2alpes.fr/uploads/file/nobuxez.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/65352964264.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=6th+std+science+textbook+solutions
    • 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_off0001035e.bin
00a231ed971dea717b43749e29bc6cf1c22c1ac7bbf7c11c8949c4fe85a7b4e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16748 bytes
font_01_sfnt_off00012ef2.bin
72359d6cb37a273eab75c7e9a7b6855043fb72ae26355d440da6ced38406e49d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 10708 bytes
font_02_sfnt_off0001477d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 16792 bytes