Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e8f9b23e8f8845…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 16:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a1e34259b299e3bad5c6898902b96dd5 SHA-1: cb70680de8add39219b98ceab8d8264473872806 SHA-256: c6e8f9b23e8f88451b3ce53b56e4249e8a30c11fc6c079b8ac952109c2e6f7c9
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious or compromised domains suggests an intent to redirect users to harmful content or to manipulate search engine rankings. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=best+setting+for+ppsspp+gold PDF link annotation
    • http://abnig.friendship-match.com/upload/files/gojonevazono.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mirunejemaviv.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613481d36cc96---xenitibibovubuxisara.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/37300010193.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/98637140290.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24302498897.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/dec26e1caca4f666a9098b4f559ff3fa/fugikomuxod.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/82870111137.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/72960485971.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/10018643584.pdfIn PDF document text
    • http://186086.com/upload/files/somazepezebowozemozopota.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139139399734---sigaxekofineb.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/92152511559.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27d032796---42274544591.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/53971396749.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/posawitodanapiki.pdfIn PDF document text
    • http://195exim.com/datas/files/95395230219.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/4835553768.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/95705880262.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/27401168661.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/matimedusokuvorukekomax.pdfIn PDF document text
    • https://hoavily.com/uploads/files/jidurutiz.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_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 17512 bytes
SHA-256: 95f32364ad5f78265fd6b0ed5d91db85ae8911ecfc4165b156aa3d27fcb8d370
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 10564 bytes
SHA-256: 44f9eab570000686d6bfe765c70b08bc56543c7bfbfdc3ffd07f48aab73f4df5