Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ffe43579a24320…

MALICIOUS

PDF

99.0 KB Created: 2021-06-27 00:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d446c054b73c0a18ed5584f22d70e5f SHA-1: 20588f16801478d289e33bd91a6533a14d94dbdd SHA-256: e5ffe43579a2432053d8f9fcfaafbbdac675262a82b065a27a281a3d650e1be3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious content or further stages of an attack. The presence of multiple links on disposable or compromised hosting suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a2eaf5764ff4cdba2b9885e24cde7213/28825829795.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28e96e986---widex.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fce993d1d5a720c35eab4a4eb84acdcf/losuvuridabotuzezovaf.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f4a96d0814c1081dd1ab9dad34b8f0ac/xomexenosi.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51151ac38f---13792421015.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c308f0455e206a184b5babfa3e36221f/futenilibo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e5ebcdd84a6e40260b5bbe1ea3492faf/42321631230.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adee5e25186---96324994439.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0904536e4c6ed5ede5addeb1c5211c20/rafukamuzojugelona.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210612173746.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/117e130284adece56417ea6127b41573/mabonerebu.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c187a6894---vujixurifapi.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf738115d2---loforulepivumixu.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e93b5bb67---tosederodupaboxurolowuxa.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/900b6f35e4c6b9ef44dea101eae99c8f/65013905441.pdf
    • http://vo23.ru/upload/file/turereli.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/91db55f473e2f46aa7da39041129721b/39531956663.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ndankt6n9voqp3c2dnoqkqs9g2/15217903420.pdf
    • http://albertopizzetti.it/userfiles/files/78515178542.pdf
    • http://cuanhuaabshanquoc.vn/files/34685388239.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607506ae288e0---bipazugiz.pdf
    • http://growourworld.com/clients/83159/File/mujubegege.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=surah+yaseen+to+read+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010671.bin
cfe7b6727e93193be111a3e7d3f4b6f384a70b6863c327e71aa534c96a0bece7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10816 bytes
font_01_sfnt_off00011f1b.bin
d1a5f5fa4a76c4e1a089a105984b00b9197923ef5080ae1bfa5f4ef0cee53140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 17912 bytes
font_02_sfnt_off00014d9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9D 16792 bytes
font_03_sfnt_off000165ae.bin
f1faf6288d7703e030945c2510770dd4f8413bba4840a3a61f8a6f595adec7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165AE 16932 bytes

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