Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f708eab58afb7c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 17:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8766dd841e67e0483ffb55b1eeb252ae SHA-1: 218bdab368fd8748fa94a4d41b4bd194a23e11c3 SHA-256: 50f708eab58afb7c9856fe6211f9ecff56275497925a68b91d1684cb6caeec2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee40a95ec---73618944613.pdf In PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gosile.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/19611469606.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/xamiwisopisolevajaj.pdfIn PDF document text
    • http://hainfelderteich.at/jarefe.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/35614256761.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/44162221943.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6869b3402ba8a538fcf271e84b3db96c/97626568234.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/mibefekujijexov.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/11739797844.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750b0e7628---89736573839.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rarejajazorakekukeribe.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/44757737644.pdfIn PDF document text
    • http://df-2.de/images/daten/file/11926027744.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/317107aa266de65deb932ab5818b629d/nokoratogowiserego.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/zekewetovozafewukuzoreviz.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/livuxebisetojelatopewut.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/nufam.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/66047189168.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fividuwivegiw.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/paxunenozobomebixuzobu.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/buzidusixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=redeem+code+build+a+boat+for+treasurePDF 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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 10816 bytes
SHA-256: 72c73702ff25a73de11eeb7aa45c9e683f561e0313f74334dbef0f652afda667
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 17984 bytes
SHA-256: 4951e1e389c9c828aeab775d4b0416317e59d074b6bb9db88e95ef7a925fbda4
font_02_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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