Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84e92e09c8ec723…

MALICIOUS

PDF

82.3 KB Created: 2021-06-22 09:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51853b3647f8e988d744f93fb572faf0 SHA-1: 41db5f83238c56e2fb1a19bd2ebe2a4d45fd809f SHA-256: c84e92e09c8ec7235c2ddc9a59479bd6dc69badd52aa837ddaa41ddcee232f7a
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content or downloads. The presence of multiple URLs on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8dfdf0809b091ec9bbf7f06943f02872/vofivabab.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/e2gdsm89a0rk9kmd25bg2au6e3/98601425759.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbec3c5cb---14441479375.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df148995f---buvelizojelin.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c35e0dc---10280308516.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/127bd29e19713de19d4249e03c207cc1/86493496057.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1386eeeb3---nudopevuwonerojixoduka.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d971a699aa6941c029eaaddfb2f376f9/92461841322.pdf
    • http://guojingmall.com/userfiles/file/%5C/76375215166.pdf
    • https://chungcungoaigiao.net/uploads/files/6088556570.pdf
    • http://eltonltd.ru/sites/default/files/uploads/mikiwiwepefewuxixa.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f056f86d---88005767200.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/wavonikugevamoxidaxaxov.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37f84b7e6---97014702942.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8a0818ef61d8587e3c5544f84c2ff67/solilidudanubilogaxa.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/141a6776a3e993cfe1e2b001db7ce314/93175528938.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3dec1d20f---84119496837.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b583171834d---timipoxegafegejitibobine.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bc1e0938ad29609d3737c8a2dd146e51/diloxokogubujigubozapopi.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=7th+new+book+social+science+tamil+medium
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f552.bin
0fb0726ed1992c990154a6e0b37b4e8fe91a2ec7f906ba58aa7c63e3f7770d08		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF552 13016 bytes
font_00_sfnt_off0000e326.bin
4ef9f87023a34f79684c8f319c74be64f43981cc3cda6fad3992e8a91734def2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 5364 bytes
font_02_sfnt_off000115f0.bin
5bf81b17c3d7c3d2b683d2714e0756e68f10851070cc9e495362e8f665ec3ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10464 bytes

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