Malicious PDF — malware analysis report

Static analysis result for SHA-256 27162c1217e24431…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 08:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 606d60a740fe589c44bc3befd4e2327c SHA-1: 31403befbd3f9d519fc86a647fb2dc6edd5cbfae SHA-256: 27162c1217e24431fa4aaa81f6fdf0677ff62c6f34c56c688105474636f69379
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting. Heuristics indicate it functions as a link farm, with some links specifically targeting compromised CMS upload storage. The ML classifier strongly suggests malicious intent, likely to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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://inmaabiladi.com/userfiles/files/jopasaduzivijuseza.pdf In PDF document text
    • http://klm-co.ru/foto/ck/files/73927429965.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/naleluxowalo.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/saboduwanulogoxemex.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/35984326723.pdfIn PDF document text
    • http://citranco.com/users/files/87389104015.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/vimoliwile.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894dfaa5cd---dabuketozemanivux.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/bibepijekumuwikudugudaxoj.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/tefef.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/vibemezabofaletig.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/95927152826.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/wabululesadofidotit.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/xibudaguxikajobefu.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/pemidumet.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/salemofezati.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/75217902135.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/xebazugovivadudubiwol.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/93355087559.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/22883960257.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/jamodabugetilin.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/mijunibafesasuminujij.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16144335af2028---63317435814.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kazenat.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/79876567763.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe64f2abd---68154181365.pdfIn PDF document text
    • http://cloverdiamond.com/file/53488762975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=d%26d+dungeon+master%27s+guide+5e+pdf+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 18872 bytes
SHA-256: 7f23849021a260aaae640147328fb0dd81e2d289f4f751db4cb8a29e5fa4ea01

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