Malicious PDF — malware analysis report

Static analysis result for SHA-256 542507e18e19c8f7…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 13:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f84580bf984ccfc4c5fdc1062f32e752 SHA-1: 55835ed2d479a2d925e05a2e734d1268b19585ad SHA-256: 542507e18e19c8f771552d80aadd4b502129a9e026167ec5e64f283ec6520d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gleneaglehoa.org/images/file/nitafadibo.pdf In PDF document text
    • https://mldom.xyz/web/img/podborky/files/puwugiwadik.pdfIn PDF document text
    • http://all-premium.com/user_file/files/xewotinerazedeloxog.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160916f26bd311---kotixiluziwovedorakokowu.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021081004352370554.pdfIn PDF document text
    • http://marymo.ru/uploads/files/vogazaropimafuvudumori.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/473013f8927ab4c6f8458efd5928f2d9/92187584594.pdfIn PDF document text
    • https://sy-tech.eu/file/piwugifaleb.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fewomuxorumunadiwazujur.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/vituxarepiwutarejekuzateb.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ee0a8b54d---kalelujilogivoxaruzamere.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baxukikaxuzisubevilaz.pdfIn PDF document text
    • http://atomleasing.ru/media/File/63994111273.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e89bfa2b0a0---xupumipidisur.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7636d0ee74ea30f047660d4ec8d5995d/sitadorovofaxokofa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gor6prp83mv1t82ia75ch35im3/fixenuwivibapoz.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/xoxonexop.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f59868b80d077a7492feb310dbe2596a/99640433252.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/sodoxal.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/53113042913.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1caab98d24428a348fc31887c8096d2d/52382057439.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551df194bd---wajujexuxolutefewix.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zojuforabolafadukuberewam.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rudejisarubemabiwapapa.pdfIn PDF document text
    • http://chamdure.com/DATA/files/riviriwojomabololani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+4+ano+ensino+fundamental+pdfPDF 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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 11352 bytes
SHA-256: c14f6549f182c10dbf6a1e1b5c869ce95b245d8758613977e378799acf2422b9
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 21756 bytes
SHA-256: 5a24ce2cd31a1842c624bd3398b323814492904e70dafad494e23a63ffa2f1f9
font_02_sfnt_off00013c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1