Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f657251e6f78f7d…

MALICIOUS

PDF

81.8 KB Created: 2021-07-26 03:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a3e984080c054c053b5a5b581850eae SHA-1: b0f9f8f62719af2d71096779a1d9217d206b33de SHA-256: 2f657251e6f78f7d8ebf59224cbe97f36b7e602feb157c9470cca538bb24cb2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the presence of multiple compromised URLs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://shinex-auto.com/userfiles/file/84346333965.pdf In PDF document text
    • https://susta.vn/userfiles/file/tididevuw.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/20065291439.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/42350363945.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bovunovuxaxop.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d0a465f5b7b1cca3bc0460135bd32f4/tigazedunuvisu.pdfIn PDF document text
    • https://keongracun.org/contents//files/88181711423.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac3b1cae3---93009740558.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/92689ea71d5b1af891c659f97589076e/nuket.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/guvofagawilopuxel.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99559e8ab6---wegajelimawoliliw.pdfIn PDF document text
    • https://subarini.ro/mm/file/pezoxux.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/fofefivepegixaga.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/241105466999.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/denudilexef.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xutemuledova.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/lizejawixe.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/kunijewezubozilisepabe.pdfIn PDF document text
    • https://dietacud.eu/upload/file/56374838451.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/26f21c17a0825a31dcf8697ca1209e9a/35803742510.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a096245e---14111141368.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pixejiwa.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160940fbada692---9667251677.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc327e509dc04c26b84300ef33ab6/geponofidukakizajetilowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+download+pdf+file+to+ms+word+converter+softwarePDF 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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10908 bytes
SHA-256: a7a81ef40678dec296bdaf3fabbc9d688ee8174973e560668fb958d514743952
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 17444 bytes
SHA-256: 306a5d9cf203e4c8cfdac53bce3c66a7e4dab4884e173f8e23419020cd2fb54d

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