Malicious PDF — malware analysis report

Static analysis result for SHA-256 e841d522982d2be2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 16:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bd070999f8a82facb5401a52ce3b45b1 SHA-1: 28aaa003abb981c71649f8c085f50f260e58e294 SHA-256: e841d522982d2be245a76829cfaa88a5700d12a98cafdedb36dca27670c34827
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. The heuristics suggest it functions as a link farm hosted on compromised WordPress sites, potentially leading to further malicious content. The presence of a 'Password-Protected Archive Lure' heuristic strongly suggests the document's purpose is to trick the user into downloading and opening an archive with a provided password, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6207bcc23---12695859254.pdf In PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/34127367370.pdfIn PDF document text
    • https://birotex.rs/images/files/mubejerefotivela.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/65676132411.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b85b9c94082a529aaec7c8b33a90f078/95575538572.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d7b715828a1a0d3862142ac99efc6567/salewev.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/vewude.pdfIn PDF document text
    • http://52963566.com/upload/file/202109151724057427.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xogofijedivapigopodarib.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907030033.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/kowujowe.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/50465911927.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/joxozavivavozetebomigobi.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/10414397997.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/tozazavavarawa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a584767df---davuvuzubopex.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_236539706F665C50.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfd216c4a---ketuvupopumapor.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vudazokazuxafagaluvaz.pdfIn PDF document text
    • http://apcmagon.com/userfiles/13931642975.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/64b64bd2533e0d7fbc9ae485f75168d4/pagifapogunozamutinuwu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144afc7d61---15709528728.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/takubidusogigid.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/9128793444.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/7605294103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=copy+itunes+library+to+androidPDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10768 bytes
SHA-256: 8c23effe38f9f9d628e4f23c42b405178d37278b6cf0b9a29110f6f95036d1be
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 18068 bytes
SHA-256: 5797a335eda960e3c8b412962a5805e15fe91bdc6929f83899d887692f5648ad
font_02_sfnt_off00012d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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