Malicious PDF — malware analysis report

Static analysis result for SHA-256 946b53e1414b852a…

MALICIOUS

PDF

105.1 KB Created: 2021-09-04 23:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f430e005678925adf20137835c61eb9e SHA-1: c6fdd94da15864be55943d1f13a6947327ceaed2 SHA-256: 946b53e1414b852ab65ed8b47bcbdaf80762e3a3b7461a9764067c04b328f375
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae816ca4b---papaxukip.pdf In PDF document text
    • http://shipsupply.ru/userfiles/files/salixabamukatofefiwo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b270912b2---vofawadowagig.pdfIn PDF document text
    • http://qca.ch/userfiles/file/tapijedolofo.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/gufamukepegagopobeniwavi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dedojegamax.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a189059d1---3981472637.pdfIn PDF document text
    • http://rubensova16.cz/files/file/vixodoxug.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49da7b55a---25680986985.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/81854533817.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/pobuzokipil.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/vokibofokufezozat.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/76a7e14953e1bc8783a81e810a745f28/65375131284.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74bdd815b---lelujozavafepemat.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8a14f5111a47260f9d64a03ef692c583/64441976559.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/82968453341.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9b68619e---wugif.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/167bbfe0491751bdb732a69c321c3940/63023441660.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/v12liba17koscdeg73lr2iiaag/sonevanoxojelopudinovexi.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/situxupa.pdfIn PDF document text
    • http://techbis.pl/files/file/78975975314.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/zubawupu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/95772425856.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/zesaliju.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/25458139423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=encyclopaedia+of+islam+first+edition+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16520 bytes
SHA-256: 34b21e50de71116a673f5192142275fb065d82651cd185a11b6e39f8f8f17dd0
font_01_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 10880 bytes
SHA-256: a95490c6a9259568dc3afac9771b81f3a79c21b6550f45df075799c69a329a8a
font_02_sfnt_off0001361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_04_sfnt_off0001571f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571F 25024 bytes
SHA-256: 412e35f42f88163e79cef6245d4484731723fe7dad603763222afe93ac0ffe6b

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