Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b1bb171eaa2f24…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afc5a8c61342fb80b65dfcd24950c1b8 SHA-1: 108e740a03ee6926f8b6d9c86fe601ee9728397f SHA-256: e6b1bb171eaa2f2474b977388be40e91b094fec7932355c515dd2d10713c4117
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs are designed to redirect users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab302fc4b---4524533719.pdf
    • http://hocikto.info/userfiles/file/76465075640.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609acac1a44f7---17660254918.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90d3629eb3---xaroxolozet.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c083426a---8989724716.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a85eea5b2e5---39878397513.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/50ff2868909f3178972e7331ce53ff01/318865266.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/cbb5f56126f488b37c16995478eb2c42/bumidexaveforekabusob.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c826d6387c---45734330551.pdf
    • https://fotoprint.lv/downloads/file/45822651387.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0f27523dd---77416187830.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1ae6cd06---wozul.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/74670444590.pdf
    • http://4grd.com/cmsimages/file/70828536803.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7665a0e6---39484893977.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a1f92934---nogiwexubajor.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a511e3765---76072163777.pdf
    • http://extintoresorigen.com/images/editor/18580833765.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/decf0fc3f30650772c0f08766cc48c4e/wubalipuxamobonavozezeses.pdf
    • http://jrpst.pl/userfiles/file/mujisodesopalofereveziz.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f9ae579797a9f2be146eb6207b9f31e4/35143839638.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d33877aa72242624de5d1da909d0063e/kisajamofuwivepatuwadazos.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608690c2a65d2---52882594431.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/41063d3883157fa6fa1dd89086a5b212/gaduxogepe.pdf
    • http://mispuntossaga.com/campannas/file/puvawuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+option+delta+how+is+it+calculated
    • 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_off0001094b.bin
2f1c4bf47ef0a0381787e619d24365e9fa874a9fe3670aad21bb5a764bc7095e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 18020 bytes
font_01_sfnt_off000138aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 16792 bytes
font_02_sfnt_off000150c1.bin
a8273996212f0d333489208ce4dec0636862de0ef53d69fe47162c53eb95cbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 10688 bytes

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