Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9e8a98ad68825…

MALICIOUS

PDF

95.6 KB Created: 2021-06-28 02:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b21d442e9b8be369e0f7e2eba8129d5c SHA-1: 07e99897c63e970fa9b04037bc26b9ed4cc1da33 SHA-256: 40a9e8a98ad68825eb0b6f9410380f178f5e216e9f411f4f67ea230db519d47b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the heuristics strongly indicate a link farm designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://audreyheselmans.com/_files/file/zavegaruseruwutewikogevu.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/14c2922d35f6367fc326a1dbfcdbf165/tofekozijukivel.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801af0dcef7---bokumajalorozaxitipigogib.pdf
    • http://www.jindatunnel.com/up_files/file/36866231435.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/dcd2dca7d3b631f5d2c913f2d13d002b/jujiroganineratenafid.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/uppdfaq6n5tv6e8mpbgt73go6c/12134026599.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762856d68d9---jonem.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9d372229---22198930667.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af087566883---8126435219.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a034ebb4ab1---55135144768.pdf
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/kipominewoboxax.pdf
    • https://ilcaminodaugo.it/file/26842458169.pdf
    • https://pima-alarms.net/slicice/file/23407900811.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b251e7638e20b23d338b640d1f7c47a0/23491458970.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2e8481ed6b03c900bb0f9ba74b876700/zubuwitaregudavibotisije.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/26414906135.pdf
    • https://vieclambaohiem24h.com/upload/files/jemerujoti.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59fcc68e3---49697159840.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/to552kbnkuqtc78igmerqrbhi7/80326935005.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368c39466f---80054879447.pdf
    • https://maisonforville.be/documents/file/9390738725.pdf
    • http://studiomarazzi.eu/userfiles/files/4904130023.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fda788bbb48f341acec1b25d3093e195/38749589205.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c213a079b98---tifagagudituzojudomubeguj.pdf
    • https://nnkcreations.com/userfiles/file/rugimopuloxanetopomozimip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=normani+rolling+stone
    • 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_off0001138a.bin
4f0e1f85262492de73609f8fc3df40772644418e12b3ef183bba2a5395172702
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 10428 bytes
font_01_sfnt_off00012b27.bin
9d561f43e76ce8e2c5d9146ee8dc79d584c995a6e6347ed5cd89503b07f96756
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 17536 bytes
font_02_sfnt_off00015949.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15949 16792 bytes