Malicious PDF — malware analysis report

Static analysis result for SHA-256 97621fc65f8f556b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 06:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dba79a660e4e4970a77ebe41723b6a5 SHA-1: a6be58ec4d38151dac51645d7eef8f4a75d46bed SHA-256: 97621fc65f8f556b37a7d13753905d2680545f27bfb9273013d6ff7e35dd8013
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/77d9fa44f9d5ed87a296c78f34b6b1c6/31905614181.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/62932554894.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8e479e0d---geraniwote.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa203748057---sakibijopofigi.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed31101f5c---70403174433.pdf
    • http://roland-toys.eu/userfiles/file/kuwutejerobifefexat.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3284be621fa20d2d5e740788dc04a5a8/25430571748.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/44063d9b4bacfcc46316c91129c94ea6/46919768554.pdf
    • http://musorcentrum.hu/files/article/file/gedolaravumoxamok.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/47346c09e0530a2d3fb6bb17c173dae3/46155457179.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a97cdf58---32935735255.pdf
    • http://humanitool.ru/userfiles/file/pipalupimetu.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nudqku2qmh0i4kdoi9k8lfbcqg/23670052738.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c057f8b4fc2---52217782726.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099943aac266---88111933477.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160750b2e997bc---83117203439.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/abc1910f5196ac09c51aed0be27f24e9/mosidawiposozopugigenirun.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c13d0e62d---mexopusa.pdf
    • http://apexibd.com/uploads/fck_uploads/file/47603987335.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160944837ab0fb---8415575395.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6fa36f31a6d11f3230d0657779a19e2c/43433557808.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e859f22cfa4949ee279f5be9a224f6a8/zokodiwiluvatoxin.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/89454e3197ed5e906f886551acd0102e/rojiditezaluwi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kyrie+irving+durant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecc.bin
962e058a36f23f0a445af00d6f9fc9b71ec08bd51c994bc302d081b0774bb68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10360 bytes
font_01_sfnt_off0001061d.bin
b3650d42f4b56f1e34363fad806af1407648b9afe1dafad9123e875838a55848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 17484 bytes
font_02_sfnt_off000133be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 16792 bytes

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