Malicious PDF — malware analysis report

Static analysis result for SHA-256 299d1d0328207877…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 22:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4951b5896f395b191c94c9a3ccc7700 SHA-1: bcce63cb3da382aeca707ba851cd4b3faedc4063 SHA-256: 299d1d032820787766a5cba0d5c501b465225662363c4bf3fc5a05dbf96da27e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=thinner+leaner+stronger+reddit+pdf PDF link annotation
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/58349586834.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c556a09a2---matigetem.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e02140050f4b3b653c3f8c67438f58ad/38433473722.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e783f27b64999058d4c382913618a492/40787027950.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/54844331341.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lujokevigebivege.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/14220246911.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9kusn56692un7u11nqrcjns78f/mexufemizesisokupoduvagu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/777049901d0f10c8db80bda29fd37de6/43135641095.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/47238074373.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/bukobadikewomorefubupa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1dbebe14724544f46491e4ce4e9b03de/76120284368.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104fdf089877---14559219410.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/zawepuka.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/26l0kij76m8iipd5jqm8rur1s2/26581410819.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e686013f---81883352537.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/lenus.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zumupilutufokafevuga.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/disibegadibazowuro.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9bbd0c3fd---kazovolujiwow.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de44ae9a75---dagupazodagetizipesu.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/zejer.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3f5e63854abbafbe825d836eb7c5921a/bevamogijegakotev.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3f5628a027f7bffbb3458ff35311e884/zutasolebowaneloderiko.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xetixupe.pdfIn PDF document text
    • 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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 10740 bytes
SHA-256: 40ab73fb7d0ebc8e4aebc38e6225ac0640e91f9d90d99d10190c1518873c3a63
font_01_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 17204 bytes
SHA-256: 1b46ffcaa3e55b42c2843ed3cc880bc4c40a71e7757a8044ae1a0146595096ef