Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fdbc435cb1ffe9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 19:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04b7a19f33f1925aa17c72405cbed0d7 SHA-1: 7f74431c909abf297a82060c1d46f1c55b5501ea SHA-256: 16fdbc435cb1ffe949aedff3315c63eb7419a460c2c3a518d902d519dd96d360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. No scripts were extracted, but the presence of multiple external URIs and the compromised CMS upload links strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=genie+z+45%2F22+dc+service+manual PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a781d8e44c8---kedexok.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/9252190120.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7a4dd55---zomabeledepotamotiwu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/79e2afbca13b807fd9398c17cb8f5a33/xatitubimepudubeg.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/65510135340.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701505c60a1---33370009926.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b81176bd31b7e1de62caf4f1906d1789/33402538729.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/df83384fd812cc451bae15f474285a72/80297068645.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42bcd7720---rurigusupetopok.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/7477910016.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/20107598963.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/51328883480.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gimiwetatibos.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/75006306448.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/46525203304.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/83329946120.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d06a6e87a9---xazaxojikiw.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16119b096b49f1---jofejov.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d0e9addbb---polakisaserajazalo.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/lipedidusuzusuxodeja.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/02b6237094eeceff60e095299ef4856f/gulurafotexodojexi.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/72932352842.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/758f486b6def55b1d838ceeb3abc7814/24698253056.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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 10944 bytes
SHA-256: ddad810541957ef17189e6c61a4c86df85ab68361976c12a205529153c9e0e18
font_01_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 17656 bytes
SHA-256: 3fd7d343e1440261fcf1d9d71fec57784a1fd10c07141f3d49c6e7a645e7ae40
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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