Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b359f498e98eeb6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 16:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 948225a5eddfe82eb5bf7aedf79c481d SHA-1: 81741199462b17a88c20122c23a34c9af68faecb SHA-256: 5b359f498e98eeb6e791702e9c928df21e632cc99adc2b7dfb263c7616d34d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://heritagecambodiatravel.com/userfiles/file/183391679.pdf In PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109041001133571.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/22139827704.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wugeber.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136565aefab8---badesujezari.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139425b299c3---vigugovibijuvemevifatom.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/jobod.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/23857870775.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb091f06---dizejijulama.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4478d329c---95764193257.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/79716320007.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/40981194069.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mokuraguzolavejeg.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/4500043084.pdfIn PDF document text
    • https://kiptep.ru/file/66138105154.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/13f209c1d960a23d42742b2114086666/78020185774.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/78628067183.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613246e4caa46---57138710012.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/61880078060.pdfIn PDF document text
    • http://elma1.ru/!upload/files/30298441244.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/gagezidiwido.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/34207815730.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908105749.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/35619171176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+mario+kart+tour+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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 17464 bytes
SHA-256: dac042c2b3e66139cbb08c28e0f60942a073e4c7bb5903271a1c3a83d0c31eb7
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 10532 bytes
SHA-256: 90755b2e7518394f81f0cfa390238620965bcca6c7d4422f5b5410e4d67440c9

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