Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff401274992c9e50…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 01:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0784407b39007baeba62a543d6ac6f2e SHA-1: 349ec3a68f6824678483f00d78a3db19e1ef73e1 SHA-256: ff401274992c9e5057aee20252d85ab257fce7f12d1364a532d6d9c0bf6e8a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=order+to+watch+pokemon+series+and+movies
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609df34c4c352---sezofixibimixedepikaji.pdf
    • http://tivatijapan.com/uploads/userfiles/file/junid.pdf
    • http://innotack.com/userfiles/files/kuwolu.pdf
    • https://caribemed.com/userfiles/file/xunoxudokafadojadu.pdf
    • http://surmounttravel.com/userfiles/files/68156355806.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1ac78916---powaboderepesififar.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/11228953341.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/68ac26457c5313e4c977d060262eb5e8/domotopesewaxufaxo.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918349a062---59719618413.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7d9c30ba---detopa.pdf
    • https://aedwea.com/upload/foto/49677583387.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xokinu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec26921a9---46929567984.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b434vdmusbulfadrccks0ftru6/36935001516.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210619194756151.pdf
    • http://rydelko.pl/userfiles/file/woxorozede.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e959d711ccffeb3aaeeb20a1826c212d/22570299695.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e8b8872b289510abda6ef0371a7df8d7/29871534403.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d09c4ac0248---mawikelilujawenavonize.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f7fab538---jitanusolalafu.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075558478ed8---10246755483.pdf
    • https://acronimocostanzo.com/userfiles/file/sabolobupiwonumuwetawi.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/38554637576.pdf
    • 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_off0000ec16.bin
f5de198ab9acd7b4da992740b5007048ce034221a7023cada4317e41dab7a40d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 17320 bytes
font_01_sfnt_off000118ec.bin
227ebe7309fba2c944c90039612fc67b9622ad42cc2deb2a7b33d1459e309634
pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 11000 bytes
font_02_sfnt_off00013268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 16792 bytes