Malicious PDF — malware analysis report

Static analysis result for SHA-256 847a1327f3a98e19…

MALICIOUS

PDF

75.6 KB Created: 2021-08-07 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb5d9ac94a3211198c1d48ca774352b5 SHA-1: 6a84f268c2115da9e2883d456efc96b951c1328c SHA-256: 847a1327f3a98e1974af210d7201da60081b7e7c7744a943bc040ed2e5b9e2d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=clash+of+clans+town+hall+11+base+design+2020 PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ac948d1bda18eaa04671a3b871dbfe07/8032454244.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16109994023dc0---mopudavurikiregigod.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/21240227199.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e40c412a---doxasepewaninujosu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755da89335c---57401253636.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/90890924895.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/91766179544.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/udofime5o1pfthjmv0iofvv8b6/pusijeganasavenepipaxonu.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/jaselomi.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/28178799993.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/99833299878.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zazitiveja.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a64e60449---gezejipubi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725d3f611d6---68547899408.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/ziriraxibizusoloxuxuviti.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5401a90ca7---gemaluxefomakogowe.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050320303944.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i78jdmoe447oldk1357h1opbht/xobizinoma.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/sesirubibisogogoxuwagebo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pofamovajobexepukisobi.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/ruwixifivab.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9521ee26086b5126e104930ef0dab483/numajebosibekonozu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fca521e57d5c71e554667b3c4a539a05/vaseferuvibo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c3f33e45---55885954792.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_off0000c1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 11204 bytes
SHA-256: 375aa6dff5b263eddfb4551301274dca49931d79d1fb987e5cfe6279ffb1f544
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16260 bytes
SHA-256: dbae120196d860dee3da47bb23a956819f90942f71decff24d1cfb2080477a92

Open this report in the interactive analyzer, or submit your own file for analysis.