Malicious PDF — malware analysis report

Static analysis result for SHA-256 490847256eaa4269…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 22:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69a0697e5afd805a252cf8d2f2d8d8a8 SHA-1: 1aaba16c934a98b8d06cad01dbfa6e8b60d2515e SHA-256: 490847256eaa4269b57bb3a014b33d5b720fe90ee2caebc360efe6bfee510b8f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures, but the heuristic firings related to link farms and compromised CMS uploads are significant indicators of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812dbddbdb---56533909343.pdf In PDF document text
    • https://leifs-auto.dk/images/file/89448549861.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e40b1c62---jonetaber.pdfIn PDF document text
    • https://famecosmica.it/file/xozimidivesebukojujiru.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/86019c787f8907ac7de7ddc2c9cf5d9e/zegirusej.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1d57t4sfimkkafvsilf5l7grq1/lovalijenozi.pdfIn PDF document text
    • http://minerva-collection.net/files/files/5274155065.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160abb983bc2ea---fapikitukutavagelobezata.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/miwedomidigufegitutinos.pdfIn PDF document text
    • https://cecprint.com/images/file/47120386111.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/65903842696.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07af5eb487---fexativoguxek.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/jatiguzezujamuz.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wisugodu.pdfIn PDF document text
    • http://budropol.de/Upload/file/wajemavasibadujunexoj.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/gugizodajuk.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/7373828141.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/73121847602.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076db19cc917---18410852780.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/m04bsc0u72jp5dnti26umcvtv1/26039266484.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b8c51a4ea3e412828392a4431d2e8254/kogamefesedatuwemomezobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stand+alone+and+grid+connected+pv+system+pdfPDF 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_off0000b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB736 16276 bytes
SHA-256: 71d00c3533b35c748b364da730fd4490968e9033469084db44f9e54a020600cf
font_01_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 11220 bytes
SHA-256: d3024da6ecd09d5817940af87919c875cc8b6f0c57d106d73940452abb702548

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