Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0ce63febf7503…

MALICIOUS

PDF

75.9 KB Created: 2021-07-03 07:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe8fc380d58398a8a1a8b551cdbc5b2b SHA-1: 82c6cfee8bc17d078101d59cc56ba8527113e0a3 SHA-256: 87c0ce63febf7503726b4b3fcdea0344eec740aa6146f2dc78aeb8be7be1ece9
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/11def1172106804728ae252767101b7a/72968900029.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5d5a541b4d8f337311ea264b281d4661/borijetenekogejokajez.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873390c86a---31650540377.pdf
    • http://plafondchauffant.fr//img/user/file/sabevepipuravorije.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c21e48c89dea9cdcd1f8e711248af222/sapes.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f20dd0086---84606356129.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/34db3883b44a0fc558fdf5f57a2c67c8/lifatanisa.pdf
    • https://windsbs.biz/files/file/38662851035.pdf
    • http://gsmontaggi.it/userfiles/files/vejutufitomufutesa.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/15347002852.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2enasaacg4o58g4q84957ofu40/nipuwuropuxurogug.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca228f98d---84779461434.pdf
    • http://joyearland.com/ckfinder/userfiles/files/16971462332.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pbu35nbhkftjqejrr9ep1da6nu/filipujeterox.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a6395f7c---26352527870.pdf
    • http://bezagsecurity.cz/userfiles/6121122931.pdf
    • http://colantuono.it/userfiles/files/momiwububezenamedor.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095be9f533f3---5884999789.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d02796f67---80484998213.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3add466e---tuxipozibikagovevo.pdf
    • https://aplusadvance.com/naver_editor/data/file/8179187265.pdf
    • http://constantemail.com/userfiles/file/1623515072davazoxanosajibalow.pdf
    • https://dialogueinpraxis.net/files/docs/69401543360.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a3bf0042---28244271813.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=attack+on+titan+stationary+guard+logo
    • 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_off0000bc1c.bin
ff4ec0a8f50d93516d009f21855f996fd6c54dbe529c690f113deb6a44e1b78f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16516 bytes
font_01_sfnt_off0000e6a0.bin
59024a6c73296eed4e66363d24338cffb09d971e4e3dcecbf05b35dc9d8a7218
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 2336 bytes
font_02_sfnt_off0000f0d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 16792 bytes
font_03_sfnt_off000108eb.bin
803409acbcbd7f1ba02a286102f0c6522647ae5f3ea4e738461b2208f79f89c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10700 bytes