Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bead79f079054eb…

MALICIOUS

PDF

67.3 KB Created: 2021-05-28 00:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b388c31ff005050084aaa1298f4bed SHA-1: d2c5101b529e606be711852b55d428ae1170b6c8 SHA-256: 4bead79f079054eb1ccf5a5c1b0ee147b6e6afb03179bb062909ad5074c9b396
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it is part of a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, contains keywords related to Android updates and Huawei devices, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 5

  • 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
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/182c37afc1bda108790526dd8c92a812/notabovowadubuvemegu.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab940e0bf1e---zimorolejepugapolakud.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ef354a5cf750675f8156da9dc773856a/kitajikuvojumifuvesoko.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/pojogiguwuraridinaxeriron.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e45acf06---vaserezisu.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbe0e99a5---69253949164.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd85ab4fe9---91569534852.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7bfde7b463fc6a17d7f5885709e79373/8675264754.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bc2f08c8f1b355c575a8200cdfc5d3cf/68107268497.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7bd9e18657b88790acb47d5f5066524c/21712079914.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7c4bb01e02b40b6c57b54af845830921/mejufagofaxoresitowu.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb32c5635a---polav.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082d94d9f9da---nejoreke.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9a5bc7e390d34fead62dd1abe9239dd4/nodezi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef57c830f3---mibetetitirimunimopulirir.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/90d595d3f7ac784b118f0b044ca6547c/buzunimekolupetorazelero.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a17ab33f---pikar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=aggiornamento+android+10+huawei+p20+pro
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72e.bin
6b5e91445d7ab38ce512bbe93f37813b70f8daedf92efcecc5522189e61587a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 5568 bytes
font_01_sfnt_off0000ea08.bin
e26727083022d116b8568c5da36e09577c3435c0ca5277b1c5148d69f0f48773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 10528 bytes

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