Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a4b04450d18684…

MALICIOUS

PDF

87.1 KB Created: 2021-08-29 04:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2471e806bba554d771c61fe0966df7ab SHA-1: e82883e1ea0319925e3280faab5e5d16c1c3b224 SHA-256: 54a4b04450d186849637a37c2e4bf7c337357ad6a188fe7bc6f3eee130ae429a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://noithattamphuong.com/upload/files/fokigadafoxezodexitarur.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/zisavarem.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/83636012856.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/52364881794.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/66671201431.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a502d16b5eff91059273aae39117d6ee/wikumesedifoxopivagoweg.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezegarabafapejagevako.pdfIn PDF document text
    • https://strechybenesov.cz/content/48549191015.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/melidopumexiluwuxewiret.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/39162467838.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/79293745369.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/susaguzej.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/75919227949.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452b64ace6---21943271791.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210815011308.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pejufozigepa.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/dagoxunurogilim.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2f9e73b4712fc2764f43d4da3e8af80/vilam.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/44064096038.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/gigafatutisube.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/93974833602.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/36062720760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=c%23+string+after+substringPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 23940 bytes
SHA-256: 820afdb296c3b95a7d1d8853f10ab579b0cf06806523121bd01bba2770e04dbd
font_01_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804

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