Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36d36cd0f89e36f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-11 23:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5196bee0be778150d9618a0ab7ac3de3 SHA-1: ec5f837e85046b4084bda965ae57cb4bb24e9638 SHA-256: e36d36cd0f89e36ff44c986566e2b71ee53fc4a89d797e353b98a3d5705c5a72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm intended to obscure the final destination. The presence of a 'utm_term' parameter in one URL indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://philabc.ru/uplcv?utm_term=minecraft+block+city+wars PDF link annotation
    • http://clainvest.pl/userfiles/file/fivagivuwo.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/kozuluxubegojipafikawe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369745b9910---vaputosutuzewu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49449195310.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xototetotaxajezeveram.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/wesebakugikiko.pdfIn PDF document text
    • http://ndt-ultratech.com/files/pufimegupaxik.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/wugib.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/fegexokerotuweki.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/917429516.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210911201253.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/55501653494.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/85824079294.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/jezasufujewofarujola.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908163029368429.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4653214c7a87bf07dfdde8ed8c6e4029/7701948313.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/kozuxamu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cba80a37f7fe022919123205720fab04/91178990243.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lidufaxames.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeaeab3830---nezaweg.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/timudujezeki.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/kogudojawukagazopelume.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/1124380263.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335f1629134---69453061483.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/33240638657.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/devutirumupuka.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fagipixe.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/72786107563.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F9 10756 bytes
SHA-256: f5faadceb6d37dad5fbaba78e8c21c46d591966e7fb463b57a5c724176bea374
font_01_sfnt_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 17248 bytes
SHA-256: a9e0ce3dd2ba677ee1df3adc0f101fe0a7f70558cda9da05d951a8cde596f4c5

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