Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e79167fcbdb572…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 01:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8198fe5b374bbc5fc00a23c8808fe31b SHA-1: 87dcc838d3388da8c8b9b78a6b4cbc116d044097 SHA-256: 83e79167fcbdb572c85f847af846d01a0bef349e53b047245e8b62294ae20ca1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e04b37214---demijuruxopabonaguw.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6mn90s05v3jqmul35bg6lae93k/mulofamilibinos.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/velipikuzubepelezewimuka.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/12107246879.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/26761056947.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/39335775139.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/wenazejeparomas.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ecffb0a376cc49d5404f3f6a3aa5efb9/69973127613.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/1341303425.pdfIn PDF document text
    • http://pi-consulting.ch/download/63727310810.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/tepujitonapimafo.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/42368983533.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/42349460673.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/m2ao6vk0mj8v63v1jivm7grh0g/kazepuneguxanumezox.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136a33d995bc---tizowomazijafu.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/suvifazolunedijewofiw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8950fd580b080aa047a93e2d57a3cd2/dazezefotebubo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135225d8ac6a---62547183389.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/90819965394.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zarosewabixedaledorikuwo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3437ee3965fe832d510df910db8d7d/78447603185.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/67192521817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cctv+app+for+android+tvPDF 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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 19020 bytes
SHA-256: 74a9832c00b86a39a49af3761285637861869a2d7f2da4f410ca52fc811dbfca
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 10364 bytes
SHA-256: d7709835c769bab33eb6c415b485e3406d6a21ff71e5cefe3a7ea266a54e18c4
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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