Malicious PDF — malware analysis report

Static analysis result for SHA-256 687b8234500028c2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 04:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a86c01d4449f046c103f86a43980dfa4 SHA-1: 272c69c18492b373d4ea0ff0c9da3e30d87f9087 SHA-256: 687b8234500028c2062ae3495dbb40cc3656de6b366837582083c0cfad13466f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://huntic.ru/uplcv?utm_term=new+punjabi+song+download+2021 PDF link annotation
    • https://oancora.com/ckfinder/files/dowosol.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/notabeniduga.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/buramituremusodam.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/322969482.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v1rn5aqa0nscmbclcbls718fau/40744716241.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/38018524726.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/21924082342.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/betosapulobok.pdfIn PDF document text
    • http://sun-eko.eu/files/file/88970064760.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xezoruboje.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ffcda4f5---tusafes.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/bapedag.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c03d7fc74---peselet.pdfIn PDF document text
    • https://peterdegendt.be/file/bowumabedozonido.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/dojekove.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/45489083354.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/32909763943.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a8b2ccabdca012d215c62e81a8f83d62/guretapelazolaw.pdfIn PDF document text
    • http://devveb.net/userfiles/file/1784233667.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/49782075009.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/9151023682.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60463963325.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/gajulekupowukajif.pdfIn PDF document text
    • https://fasleh.net/Files/files/65202522721.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/19940488883.pdfIn PDF document text
    • 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_off0000bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 11096 bytes
SHA-256: 10b327adcdd7dc3d3913ffff97b01f1b2469ecad817ff417c945a624dcea760a
font_01_sfnt_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 15876 bytes
SHA-256: 52049fbbea53d37e71b6eba03c0d069a36e6b71a851f1f0569dca64c7b8ce49e
font_02_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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