Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a73cef2d3858a12…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 10:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e381a51cb3b7fb15989dfcc31572c0c4 SHA-1: d8737ee2e53f5bb7dcaec1e442f9fe5ae9ea36cc SHA-256: 3a73cef2d3858a12cc45b58ec03c8ec67152c01fedfb76334542286ae4a7aa1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://showplus.ae/userfiles/files/96690353450.pdf In PDF document text
    • http://blueleaves.ru/userfiles/file/81575713957.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d386de702---gokojetu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614225de66323---rukuwutudamopitaz.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/44723041864.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139a37d7b614---vezobibuzoza.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/49211536972.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jawajolunuxavol.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0ee8b26b---pitetodugagekug.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/supavevodupofifawunuvu.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/zaxarakugojususi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b19a18ff6---mijipulezetojevado.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/xazunavovexuwizumuledu.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26627819666.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/sumub.pdfIn PDF document text
    • http://all-premium.com/user_file/files/85213642912.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/50172047070.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd826cc75c---64464830096.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/26870886812.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/57232753835.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613237c99e8d6---71723859234.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/56456992847.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc07515fc---38017167307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=xiaomi+redmi+note+10+pro+vs+poco+f3PDF 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_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 11156 bytes
SHA-256: 0c41666732dd9cd82c25365db8e5f8bb9828361ab26121d7e68d5156c7a57f22
font_01_sfnt_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 18160 bytes
SHA-256: 12bed12cd224e2f88e09e46dfdf0f5fef70006b75530e90f9d0e126c62598902
font_02_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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