Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48a11cde47775ec…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 06:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6225785877cd11f3d646f4838e4fb962 SHA-1: 5712892a344df3e72dffa2a8991c51c61b068aa1 SHA-256: a48a11cde47775ec2380d3d67da81ef430106d1b0a0e5b074efc3106cc7eb673
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of urgency lures further supports this, indicating the file is likely a spearphishing attachment designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=william+empson+some+versions+of+pastoral+pdf PDF link annotation
    • https://aulacvn.com/upload/fck/file/lojetipolo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d8b2fd1c---loxitejopakenikiw.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25323455b---44621094613.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/punixiletozononekiwobe.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/85921037325.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb67e3549cb---3806681697.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gunapulagixu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/723b6ae9f509caa4865cf9fd6898885f/laduwa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24598588303.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/fubimerikosuba.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/69862122236.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/rigirarinoguxisototuk.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/bidizikuzikot.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/movabekawigobitag.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a25978e2b---mekagasa.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/14foalknuafe424afbhuipjalf/purokunafimasavoko.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc38163e4d---ruwinupajerexodirup.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/46719109788.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/lusoz.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fodekamazir.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ac769208d3d---xoxemafakabamupafaki.pdfIn PDF document text
    • https://nexusmediation.nl/files/36413613865.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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10716 bytes
SHA-256: 5b46d54d9b9fbe9fad25e5942899fbb648b4c184d83177a7f46854cb1bdc3213
font_02_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 18472 bytes
SHA-256: c2d672fb1c3b94621fc38937c2aa5c778e8f45e137b62fb8658d7c8208cf6247

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