Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c90be10f274769c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 03:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4453bfb6d5f996911ddfc7e942fe6bd9 SHA-1: 9ac1ae9146e67495e05a973b349d655261226ab6 SHA-256: 8c90be10f274769c98054ae949eceba262d6809527ed2f10ba75de656657e75a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=presion+manometrica+pdf PDF link annotation
    • https://netlandschool.cl/files/gexadaxabel.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39b2ac53a---pilatututepuxukavuvufoj.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/pajiginaw.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/xidadiwi.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/tikabi.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/sipodo.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/33491406902.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/20414946801.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/12693973448.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c877b22e97c---lusijatovo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6f7847d6---xeninoropizabivuwupapebef.pdfIn PDF document text
    • http://soupworld.de/upload/file/38763411055.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/18544371389.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pokawinotumipejid.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4151227b2---65501735926.pdfIn PDF document text
    • http://saptpadi.com/files/file/69280054388.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b4c0dcfed8c6607663643faa85c1eef6/30351793367.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/20102932866.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083390305112---78380990000.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7me6gmpa305o9kpqj6avrafv2n/69785332162.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/47713245583.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/21932485825.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gesakoxati.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a7b311ca5011da36c0b4ddce7a9e648b/28809544121.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0962132c75---xelasekerijeb.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/tarivi.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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 17276 bytes
SHA-256: 01cf0501831bb2e747c2a139b08cb8c7f55ac2706158c8f6dd7b4b840b02b541
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10736 bytes
SHA-256: 7a23db8b9e929418912321828c8c69f45381f4092bfc3f188707cbb81f6b6d71

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