Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b3b7641548a130…

MALICIOUS

PDF

143.1 KB Created: 2021-07-24 03:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d41b7c29b424ce9290c46d4376697b80 SHA-1: c117f7ef91cfdd1782eb730481ad07af2db82d7f SHA-256: c7b3b7641548a13040d3481dedea5ad842a31dec8b9fb97c2708cc463fc53f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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 http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607673543dcd1---nitifomijagizukawal.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2c1c95437739f7e9039d21f48c9e0498/11913904033.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/72d606d0a32c031480bf0d555c7e25f0/juzafurelodukuzukusipur.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b39015f08---86030061807.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/014d20f68c7bb0e6234f685872c92fb5/47191658137.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/38aa654d13eb42065202c59e6a753289/jareso.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825cdcc28eb---jajibusog.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3657c56eaf354f8dee6fef4246ba1d84/tewewupakujuvilokukotozus.pdf
    • https://defi128.com/userfiles/files/51985141082.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb7063fe883b530701c9055bd0fbbfa5/tanimuno.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52a6ec2b3f7a5df7a442a8d0a64385a9/vezimul.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/52bd8f978b2e64b10ffe0b369c522f2a/jamaneg.pdf
    • http://hzdshg.com/images/upload/File/98060450158.pdf
    • http://mu-rrrc.com/userfiles/file/94011045975.pdf
    • http://dulichgiahy.com/upload/file/zubunani.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d32c5c6c9---65893191035.pdf
    • http://hurtowniagrafit.pl/userfiles/file/dowubebadisozudakelejug.pdf
    • http://kielcenoca.pl/files/file/pupevafusaputu.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/38552884517.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608997aa2e377---madojozazakepojejixefi.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pua3lesep4obodgc0u61cmgk17/24143655456.pdf
    • https://aimhc.com/userfiles/file/dukezupedadobofiniduba.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709da7c6dc4---84105286953.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc218e218---nivunabuboju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sword+art+online+alicization+season+3+netflix
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149e4.bin
ad5076640c0e56043f599f902d5518ba70c1a20c549e30a32fd5f0778c4c5d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 10964 bytes
font_01_sfnt_off00016389.bin
4a0c27171e9bd6095206096135eae2dee712da2ea87e63ebeca877e7da02ad4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16389 18252 bytes
font_02_sfnt_off000192a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192A4 16792 bytes
font_03_sfnt_off0001aab2.bin
c348d54d9461b3b1abe83ac43b33f639d8609d9e23204e1043018e0597103e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAB2 48492 bytes

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