Malicious PDF — malware analysis report

Static analysis result for SHA-256 f205a9ecf6b0adb5…

MALICIOUS

PDF

81.2 KB Created: 2021-07-01 19:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f83fc8d419f10efe6c5f919c00aa79c SHA-1: c62b9d20858310cb59a9ae77ad32e4f37b50fc7c SHA-256: f205a9ecf6b0adb528d71c33102e8011c0860e1abe1d9e4b9b03ddbf6e8061c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de48a0fc21---dikijefujipu.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d9f4a277---95598862719.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b530f858643---69572222573.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a450842cbfe4f8a164c82f80d9748921/lotok.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/31bb193187c820a341e959e3bb8eb0ce/45146334256.pdf
    • https://petrovsky14.ru/docs/files/7759079027.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ebf90b1da85a949f7302a4cc358ca37a/zonebusazira.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1a3313aa---kawokolazebo.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t994vj25v01dkic2706855rcil/fukafekatipizezo.pdf
    • http://alemotta.com/resources/original/file/nakudokerejisadawufe.pdf
    • http://quickvideo.nl/userfiles/file/7394014929.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f9e633c1---vefumor.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbca8cf72---10810364544.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4c52d5aabe454b8d78020c8467e3ebee/71270224687.pdf
    • http://cybernet.asia/UserFiles/File/13855949769.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/66cf75b32c456eb4746dad51149c8567/63970485558.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8dad48de9f2b2a04239d662d92d4e7c1/zijowesufoj.pdf
    • https://fonixkoncert.hu/upload/file/kivavofuxa.pdf
    • https://cvsc.co/userfiles/file/91215696824.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d35fe1b7bca---zibomobiruzudubalupu.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mr1e7l7kbro18d9mumri3ldf74/71404535543.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097250226d82---3406817914.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbebf8c372a---7841374351.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=word+newspaper+template+free+download
    • 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_off0000dde9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16792 bytes
font_01_sfnt_off0000f600.bin
aa203ef11126586c505dbd501287a743c304d3d7580b8b9697c17c66f797c11d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10648 bytes
font_02_sfnt_off00010e6d.bin
c3dc887110375d01736a21a7fa2f4793e146198134f517de3980a241c451baa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 15924 bytes