Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96265d3b3089c2e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 23:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df649e76a479e7123b8b1c96a5e96765 SHA-1: 291c8ec0d693e5cb3262a3f1602428ae6f65cdfd SHA-256: b96265d3b3089c2e113363b03ef9d1ceac5056b87be477c877935616890ef15d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users through a potentially spearphished document to a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0777cb29---tekaxel.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd83161c99---33440286428.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/50446798014.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21cd2e64cd759d0a752e4a714f327d61/fipugadazesubax.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612197f0de0ed---tufovimevezekara.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1e83590aacd3dd84efc19eb3b39acb0d/94926766604.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/lelasovegavewoxuwamok.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89e7bd89a---43473333685.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/baxebol.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cea2b189c14ffacfc46909de7a208c02/56107659991.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/vajujid.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/367fd4098d575d09e21f3e2ae8e536d6/5146278159.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/votel.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/58799387165.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3f9abab79---xadoviki.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161030a177b0d1---gulepixava.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/16084477264.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/dijomidekarififamevig.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a572040d---rivolalumanulole.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kigopuxa.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/dujopetuneve.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/53a0af1ea14fd6e1326a11c11f7e0d5c/6533954182.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5e0ac89ff2ed932a952a8cbf99bab05a/xerafujomuxejimipuduz.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45617922960.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b0e65b57---gajapabujuwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=6th+std+tamil+guide+pdfPDF 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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 20384 bytes
SHA-256: dbc06c4d15c0525218ab1903b596e4e86318a3aea55c614c3c050235ba1f2ecf
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 10792 bytes
SHA-256: 7cf9e8dbf8a82b7c3a9e57819bbd8215ca81aeebbab188452642d33c13c9c4b7