Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aaba29fb21d16b…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 03:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6555c529f24a43301d6c7ce9f014ba4 SHA-1: 179939278c6ca0300a23628b50ca1dab69be8f9b SHA-256: 16aaba29fb21d16b77945582b145d979565cfcb337dbb00cc90c2a7421a7af6a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=philips+everflo+oxygen+concentrator+service+manual
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16075635aa97a8---45849826233.pdf
    • http://kojeneckezbozi.eu/userfiles/file/55876483001.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99a60f40e---8718559478.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a0a01d3ec---paxuj.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9eb19995325d833cd226b69f9dfa630/gisodewiwe.pdf
    • https://tedvandergulik.nl/userimages/file/71387365765.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/17910380984.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0699da341c---59672174221.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/gugabojixor.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9a88u26vo8iaj0nla8oi59kitt/29206090026.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/o24t94slc77vem06d2e2ggh5f8/80639621264.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7997ee67a8---tejegajogasonitom.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d785ffb8---xevuvoj.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/vidinuxovoga.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1e7414dc49a307f6b1b5cef598c0b550/49916558546.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f6bc1df---62339605991.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23623dbb0---vuwexosivupasogatonidekaj.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/75be834b58290e3d41488228d324c24e/26933481079.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098850f2322f---powogavubawewomobawebun.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/11980206855.pdf
    • http://usmleworkout.com/files/file/waranu.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/vugepevesirodiverexo.pdf
    • http://ashioke.com/images/library/File/70501389257.pdf
    • https://annjulieskarpmo.com/userfiles/file/manixoxelug.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27df2bbe7---jomoku.pdf
    • http://beulahcooleycollection.com/clients/870349/File/vuruparojosutufuzalatad.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_off0000ed24.bin
313db469ac90bebdfd242981cf607893f6a7eb39e30b150d514d5acde7f26178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16504 bytes
font_01_sfnt_off0001174a.bin
7ce3bbdaddfbc80dd57bc507333522ad92574f5d4fc2f931121f8fcb7644ba3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 11312 bytes
font_02_sfnt_off000131cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 16792 bytes

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