Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e56a82a92e3176a…

MALICIOUS

PDF

81.5 KB Created: 2021-07-18 09:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9eb60136a23f0e5b41a1970ae7f07d48 SHA-1: 0b43391ad41e916a7277d1fd184dddc40e5b61d2 SHA-256: 4e56a82a92e3176a14d75c954df2e2753dac6fd4013e67255756fb4c7f2ba7a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's upload directory. These links are likely used to host malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of numerous external links and the nature of the heuristic firings strongly suggest a malicious intent to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1441396c8---40915369393.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2ac52fc3---36499637790.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c233b8d6858---bijigituwewotuzedofe.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a63714f23aa6df4a02d3a7c0cc605078/26546780951.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/53916027024.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66028193b---38051316579.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/wuwekuzizu.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/1540764295.pdfIn PDF document text
    • https://eternalbliss.net/file/59397087920.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb79bf37c---wiwibavabujuverovenave.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9f31da4171e319f96f96d91569b4054c/74974088360.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/bonewopisepadasedirovedu.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/28557072151.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bvgu2nard0q984uc7dm3i7gsp0/42466917193.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/28024789215.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/q5ld3is32an2o9tcsltc1ekcbp/12442482220.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53443071874.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nasukezazik.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d118d5afa6b8f1b6acba9756a33f74f6/fabupokapoparogezoluso.pdfIn PDF document text
    • https://aashianarealty.com/file/busilelafujiwogexuf.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///65605119902.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d2cf7c2554a943a80dd52d456c2c80fb/wovatalidarepegat.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88521e76b2c424e665f628f095528d35/18625525253.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6f5c110f59e961774db0224c731ddcfc/vuxewodosalavinarowa.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/wevarejen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=department+of+foreign+affairs+and+tradePDF 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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 10796 bytes
SHA-256: 27ad4d0b9916f383f7fb611a69b81bc5f53a004b5fd29c01f0d794fea603e4c4
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 16204 bytes
SHA-256: 9d4e653a1167430bb1aa5b79f071050a1a43a37a08a4d323618bd9f6879f2a3a

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