Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7147c0595956b4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 06:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edf8d48d54d6df63564459e370594de1 SHA-1: 330017737c1f34e0271d7a502ebb78b51a8ffc8b SHA-256: da7147c0595956b499e7fd62023307a42c08372bbdc55849e3826ad3fd4ddb93
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. The presence of multiple PDF link farm heuristics and a password archive lure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.singchai.co.th/ckfinder/userfiles/files/zerofuvotuvotumuzanuzubo.pdf In PDF document text
    • http://retailcop.ca/files/95480592630.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/61704078401.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hcklhaofaruvig4aeittak3ep1/xekixezemigala.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109080701377102.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/97710614048.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/46268097769.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c432dd36c---lekukofevuzuzopogunerak.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4541f55f---gutogelalulawanoz.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/silofo.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pekukilaximiwokog.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zedaso.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/pamekula.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/sutujuv.pdfIn PDF document text
    • http://quranday.org/userfiles/file/tebazigulo.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/50201171330.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/20196691609.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/554d6ad091ed7136fec4313a850e4146/90988838993.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/99685064895.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/tefizi.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/muganopajagovejug.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/gikapiwaboludigav.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/19993157316.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/24621473986.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/nurili.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/wagosum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+mini+militia+denzel+wilson+mod+apkPDF 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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 16452 bytes
SHA-256: 6342b4f3b4afbcddc8ecceab5c7b530de1d884807fe05c1b80c560f25b62b81c
font_02_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10692 bytes
SHA-256: 1028bc625e79ee30cb21c7522d0c4bfc7807c9589bf061a72013f3c0330dd000

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