Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13a43aa1ad71191…

MALICIOUS

PDF

91.8 KB Created: 2021-06-27 15:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac27ad3bff8ba0e486fe0fe12cd11b30 SHA-1: fde02a9bc351ddb8fe368ea2d2e449623265d99b SHA-256: a13a43aa1ad711915d8ab2b9a31cd7a9cbf1ac1d282cc413f8e104e70bdf909a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and link farm characteristics are consistent with known malicious document delivery methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d977f74ac2f504cf6add5ccc8d856b8/33857053759.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bed68c306---58998283778.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a43e992fbe90bfe3511b36e1e84312c7/16238517130.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/kma4dbgvruu2191kml4g37fpa6/56588659724.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071661e05af0---gudofukika.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf0fae8c1---piwapurajiwilolo.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/82982ea2841ac52b9eb149432b59f0d6/dobiwolamoxewesivimorukek.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac3765c149---15101327224.pdf
    • https://festival-bg.com/media/ckuploads/files/rowufoxu.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5b965de070d24a0af1f348e6402488a9/85479773253.pdf
    • http://chiangmai-clean.com/user_img/files/29646760393.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/906908f158d309b83fb2a38aedc3d08b/9558741450.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608171a2bcdbc---56289287564.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c22a6b865---90571239744.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/uvr55n513sb1uhs8aa8b3j5pa6/buwoz.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d216c1007---4206031770.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/40338aa10c9bfaed0e1bea9fd6c2452b/jovelaxotupisi.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/fd2119ec74f2f7ddde6e5a52d7632a21/giburatetefunanumikesek.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucq5u5a1iibkmrqqip7t34sg95/direfafeloxokuzexejogiso.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3cc8968fb054412ee5deb19afa38e3a6/40664196509.pdf
    • http://eska-lift.ru/userfiles/file/lezikitisekakepow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+splitter+and+merger+download
    • 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
stream_005_off00012ebc.bin
887cdf78573a1061ef9ca88b3a157c577513e78fb754325bd4bc71ca28f27bce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EBC 28484 bytes
font_00_sfnt_off0000d32e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 16792 bytes
font_01_sfnt_off0000eb45.bin
8f6cc8360f673a82e04fbd1b0afa465f5afcc81fd06bb560dcb94668528c1222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 10928 bytes
font_02_sfnt_off00010463.bin
714000aaf4880aa6f96e2e30f1e97afff34389fb0e51db0156b3174e9e43b5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 16312 bytes

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