Malicious PDF — malware analysis report

Static analysis result for SHA-256 a400d6ad3d0ce9e8…

MALICIOUS

PDF

96.1 KB Created: 2021-07-16 11:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5388dff6fda90f2cb7fa687cb807eb0c SHA-1: 262a0c2bd33d6e33840838f3831e00bceba26752 SHA-256: a400d6ad3d0ce9e80707a667fc28c31066ad63e46aa0d2b02bce689cc214cf46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, likely intended to host malicious files or redirect users to phishing pages. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS upload directories suggests an attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91d99af12e---fowimipowoxemejitaji.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f4b39c715---99030435967.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/mumab.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fc41fc830c7403216701aa66aa7030d8/kikulixopazazisusige.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/v4q477tlua3t99920r7m5vjmda/mezeg.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ulgk80vos58b1stlro4gkhhv96/45666508842.pdf
    • http://bocghedanang.com/media/ftp/file/25433981171.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/46248916642.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766560a5aae---wipesipozosimugorarudir.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/15e74f8200d6a72f0d94d1ecc6674595/22860836975.pdf
    • http://longthinhphat.net/uploads/files/likemudafivaba.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ce9ea6f44298b899fa000113f1bea3c4/95921730208.pdf
    • http://ssujaxchapter.com/clients/83257/File/dudijo.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wawawizizatosew.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/fubokizafonovup.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087367616522---pebinegubonobenavesakap.pdf
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/98297826909.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f4e8d0d3a5aa0f7a39ab490cc313d369/53940009696.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/df85e2a3a2054b7b1dc415a657525696/37408412198.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95bcb8f908---zukabutefubo.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/c6hnt0slqkl219vj0v7clmuprv/butevigaxonasufenisudi.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a75bf4c018c---33144772750.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbedaa2079---bosezutojirugojekiwi.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2db194910f---bitaginabebopel.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e508b8b8a1a---pizipuvazodizixep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=couscous+with+beans
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05b.bin
d8e53d637cfe9f81bf53566e421a865c85feb983f053a5b79989390c9d922deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 16968 bytes
font_01_sfnt_off000108fd.bin
5cddb164982c7d9e1e4d1346670409c922a526439ab474544748dba5f82036b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 18456 bytes
font_02_sfnt_off00013919.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 1824 bytes
font_03_sfnt_off000141aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141AA 16792 bytes
font_04_sfnt_off000159c1.bin
66ef38397d63bea38789f16a3d1f7c03567d5fe2f7928eaacd9c5b18c41325d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 10536 bytes

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