Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b9de7f7568f29f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 08:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6576a8f67b65c0b9f98d25a3dcc86f19 SHA-1: 2d3a4c8ed228cac220dfa173495947124193ba90 SHA-256: 12b9de7f7568f29fb6856958e475f25c4e7894d423f1e2e588285a31487cc256
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These sites, in turn, host other PDFs, suggesting a multi-stage attack designed to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=bullet+to+the+head+sylvester+stallone
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef6416fb23f76dbace9cb456ed30f2a4/lituxezupepotenabezazif.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083499828bb7---7464459392.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafeef0f462---nijafudediboloja.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/14220b06a40f3b0b0bdd67c292eba7c9/72704807408.pdf
    • http://sxhk365.com/uploads/file///43756856244.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0urol9qviceoq38sp0vcttel35/gijenozogobedunopabuduni.pdf
    • https://daaeportrett.no/upload/file/ximibevatogigoxamujana.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d069jfgoofjscr8makuef9cbu4/1494997244.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h1sce203capmo5a7g090dpl807/papidoxumegogoxed.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d74530f2ab10d4695dccaab24f779b33/87378708318.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g5hc1henfok58d2jb7ig6qo3o5/junatina.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3smf6ma9ichdc67o7ihvsdjfp0/veramagukujizuv.pdf
    • https://sharadsangam.org/UserFilesTwo/file/61311194185.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57be1d893---ropukopojib.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9946987cb8---belarabufaga.pdf
    • http://www.pranabkumar.com/fckimages/file/fujiramizawosidamosexa.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/388b223a3c878c61224f7fae5a52260d/32167896224.pdf
    • http://guides2alpes.fr/uploads/file/fegepamefiloruzix.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6pa6u8t4ogk3mebeemkba8kovo/42566306757.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/99e57c697fa421d7fcd447a7159b2ca9/fejojavoluxajobarumi.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c923f5e217---53043897318.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4877a4bf2---sojikutadad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2f.bin
2d35dce4fafb7f6d437b3ecf02060b11080eac69060f76ac7524b5cde4dc0dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 17744 bytes
font_01_sfnt_off0001186e.bin
99d084683bbe3a55bbe33712e8585ab4c8635ffcd304642422ff6ad23074d855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 10588 bytes
font_02_sfnt_off000130b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 16792 bytes

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