Malicious PDF — malware analysis report

Static analysis result for SHA-256 e250c1398b04db4d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 22:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d54ec68260d017e3c75c8c67a0b3952d SHA-1: 80928424534dcdb44e5a7334ad7c97d8c2a7f99e SHA-256: e250c1398b04db4dd6f89f917c07e251e3b99f567c011d528ee399f1ab82e872
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests it may also be used to trick users into downloading password-protected archives, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/13303894e1bfe29490ded40a2ad11e6e/61302418557.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffcfa15998387889c02e3021e25c35e6/61309908055.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d09b12603d748a33ffe2d2a547d11304/52206415831.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/vegogonapif.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/30030241081.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/81656102954.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h93opii0709d7c3rh2tfb252qq/72869764800.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/fugixudadal.pdfIn PDF document text
    • http://rayanchem.com/d/files/63694249171.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4b92f98c365f22cf2d89168ebe3cf462/66478567267.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d61d7c9ea8688aba0a5697e43ee06e79/gologesaxonotorasi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/12887728030.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5ae082c6a317e123ef80f1576f6e75f9/loxogefelimemi.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdfIn PDF document text
    • http://aurora-c.jp/files/files/67529702821.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/zemisivoluz.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/piraveni.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0ijmpfn7lkf4hn9oa2nboarlv/5229243650.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d3782609---rifek.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2a75837040d6b3c75a22746758c208ec/4443223088.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/54219449688.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/fisuburugurupori.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb615239141---guxavaxejol.pdfIn PDF document text
    • http://russia-ex.com/5701250307.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb3d41c49279c98bc13fefc48d735800/36629438532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=como+hacer+archivos+pdf+en+celularPDF 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 17112 bytes
SHA-256: b2b8fc0e2f5cd1e93ef69bdf8dd0530222961af7ac5a1abf8554c82f57e3e1e8
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 10984 bytes
SHA-256: dc4e4f328e868af6f46cd853c78f1606e5a8fce38e6117e5c303dbecc0b2314d