Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecf9bf75a43f3d6…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 19:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd887403b8cb4699efd892bd792b0ba5 SHA-1: d2dc87f596d2324e21286b5c191f14f5f3ca84e5 SHA-256: aecf9bf75a43f3d61003c5686d61b3ac0a7413b35823bf4562c30f49e2fe35df
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0bd06e7c---76641339799.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b097c751---79411364695.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/46ad84b180e73b392f408f4f250a8daa/polixugamozajaguwagula.pdf
    • https://nikosdimos.gr/userfiles/file/gamorumepojadotike.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f8e89330---jogezufepigef.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/fujudijafidazetejadebemor.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/t2978oephbcdl4vf2mph8rn6d5/lowedisemuw.pdf
    • http://blackhorsesc.pl/userfiles/file/70901701981.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6c7c510e---3419691027.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tan2uvnap2c0i1t13ssf090150/73012413020.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/bd80c2a381ca6277e248963d25054cea/nugetuzumilekupu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a3aee07a---kapokosererowiw.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4b5d07aa15fb2a47f5063b33678a4e01/63127057431.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/514f25fa4646466807d1a64249dd0187/tapijam.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g4re2lpkussvflj3es2ba68rq5/36429914116.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095731eedcb2---14898638459.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/435590adc7010c3885a665936d67f6c1/40611834542.pdf
    • http://dade666.com/userfiles/202106file/2021061310072370554.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca59ce55a3---juwadafo.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb650d1adfb---11973097484.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c2050ccd---ratowibigakejomo.pdf
    • https://vildmarksjagt.dk/userfiles/file/21890939783.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lesson+7.2+practice+a+algebra+1+answers
    • 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_off0000e7f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16792 bytes
font_01_sfnt_off00010010.bin
300f3adb77a6852e3efbc9f85857ead443b106914df1b59d86928149c46e5d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 11020 bytes
font_02_sfnt_off000119cd.bin
f2983b6247b34557f33511a0b97e84c51798940f84e15ebc3f8c4d479518c15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 17104 bytes

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