Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a89e6e128893299…

MALICIOUS

PDF

101.5 KB Created: 2021-06-30 20:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f71b113b0c136fd3b8559e39eba43ab6 SHA-1: faa5f0c2ef7a78ce277b7797a267728709be3057 SHA-256: 2a89e6e128893299b9b419f5b7d6be08bc5502e481a04da68e6c263a9cbd5f8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The sample's structure and URL distribution indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607998968d80a---zevexuwasixukumonepe.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160781d8e4a649---33311492717.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4907e67508542d6fa809a647ac3da285/38943443881.pdf
    • http://esrafisek.com/images_upload/files/34042248377.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p70h70teo0fvvoi8biqf1umhf4/81716523649.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/905fc77aaa08aaa710c2f9f4bf5a0531/rajunudegajagotewizem.pdf
    • https://cplastik.cz/data/cms/file/waxifomisufizofunov.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076037a648c6---92806956245.pdf
    • http://stromzeleny.cz/file/15435320913.pdf
    • http://hoadon-dientu.net/images/files/pedezekofupojowoku.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2d44bc16b643f5d9c04baa7863294df5/xewono.pdf
    • http://hilimall.ae/uploads/files/nogadavalabetujeximekixoj.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/wofowu.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/vinulasoturuxeda.pdf
    • https://arrayamed.com/userfiles/file/mebaxenotebinefej.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3l4t1fiucbkkl3g6o0ee7prd5p/70357629486.pdf
    • http://geoodwierty.pl/files/file/54520778838.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160816e0da92be---nogozapeperuvuribaza.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6f75932f---84762975749.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bf11b6f51---gegefiwenid.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fac6259b93c94c1ea1f45f4c2d177454/koronadodokepuzit.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076436e8160d---8497624289.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cb6152fb---80028929792.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5f270d7c276852056a3b9319dd105941/82336271230.pdf
    • https://aviseco.ro/userfiles/file/xarapapagakafageminajo.pdf
    • http://erictex.com/ufiles/files/95528211637.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=crepes+with+self+raising+flour
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101be.bin
a293092535d1035c76548c4c07aa8800bf626fd25745237a467f2f7d800bfbf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10856 bytes
font_01_sfnt_off00011ad2.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16684 bytes
font_02_sfnt_off0001326b.bin
309c74efa6ea05061bbb12c1db00451a622f124fca32e1859c0ec3aefb3674f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 19248 bytes
font_03_sfnt_off00016546.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16546 1824 bytes
font_04_sfnt_off00016dd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD7 16792 bytes

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