Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd1b70f8a3ba4cb…

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 05:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9732b6305173bb1adebea130c9f20c4 SHA-1: b687b29bed0e910c813a674c6c1bfd56f93456b3 SHA-256: 8bd1b70f8a3ba4cbf25419841c09e3751452797167d3f2610a84ccedc04302c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the embedded JavaScript potentially being used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/207u1atqse29nh79rccgd0f2q8/wemeganofoka.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160722f77358c1---19579912558.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dj8c1f0pjj0hh3ppdsth437nbo/bofivitakisuvef.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd45a52f54---45351539170.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zizoxatemivik.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/64deef337c6a6613b18c50b32f452561/midapiwinut.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f112195---vesesefowokunufawo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed4b588ad---zijave.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/97704295888.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/48540145668.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f0381c2c01abdee5ae3bcb9ff06b8a0/72583228629.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/lisev.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092895740355---82612934496.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce827147c---fexifezujipap.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ouvv11g5ajel5a0nehf3svi7d0/paboxinaz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vubumuwafifuf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad2d770e4---30326544564.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/42263102739.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/856cb5b127149e82e5048e18b6d639b6/25391735853.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nedafebez.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/17953777296.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8ab5ea09---92487650525.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/09drtcef3uqe0ooh6m063j9sge/48450627315.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vegixobuloguverafogema.pdfIn PDF document text
    • https://bamor.org/userfiles/file/tivemiwatapamefizix.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db501bbbe---doduwuxikarugetupapedak.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6db7f513.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897791e034e---12508126188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=urvashi+hot+and+sexyPDF 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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 10588 bytes
SHA-256: 82e9075c68fb7ff140012f3fcb344489f4d2c9b2b0bee34d572f00825a27d579
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 17268 bytes
SHA-256: 2475eb86fd853788735a6d0dba2c8e56af526db1b9a327b5dc228927bd10927b
font_02_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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