Malicious PDF — malware analysis report

Static analysis result for SHA-256 4461210de0d4da03…

MALICIOUS

PDF

102.0 KB Created: 2021-07-14 02:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ab8b49a74c64ecf3d3d6f11ed17af4d SHA-1: 65e6e2e1d262f50d791188a0c1b267f227c4fe85 SHA-256: 4461210de0d4da0335a84c174a98275697d74ea2da99c7821ef59d4d0cae4fab
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and the nature of the URLs suggest it's intended as a lure, potentially via spearphishing, to exploit clients.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee000eaccd2---2520594923.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984414144e8---92548873721.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1e33e88f33bd608a38f771497fc8cc0d/wazetifunojopibixa.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/edc497e0faba21c5e0f007f9d463ac34/piroj.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a2e1c79703d8e2d04fca108df13c35ca/piranigafivasuregujazupeb.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/bolexosajesegape.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/33551019412.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3516948f47e92231f58a386dd692d4ac/38610475979.pdf
    • http://ya-ke.cn/admin/upload/47513338151.pdf
    • http://h-st.nl/bestanden/files/94062316788.pdf
    • https://tlproduct.com/userfiles/file/podina.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/vavuxawugi.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160711d594bfec---99817732851.pdf
    • https://bbmint.com/userfiles/file/99180180702.pdf
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/muvejisujikawanerotisepej.pdf
    • https://nhadatonline24h.com/Images_upload/files/8689710062.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kfnt6jbo8skpoq7remqqcfjr6b/10516515932.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b5f7a5dfd2786a9747daebe49dc65c1f/larafopijetizuwupamida.pdf
    • http://firewheels.pe/userfiles/file/xepazozimevasazutatavina.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pbbf3kb3fj24clal0egskqfbcr/xajopujitevufirolabetugo.pdf
    • http://metaglas.kr/userData/board/file/77951652629.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mncs+in+the+contemporary+international+relations
    • 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_off00012ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes
font_01_sfnt_off000142e4.bin
24a23c91c558c193786dcdd030c1aa70d446a26dbfeb17611b3d34e0cf0aff3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 17964 bytes
font_02_sfnt_off0001724f.bin
8ece31e12330127a4b63e1d3ceddf0228f254b9aca0ca45ce268e62e876b6eec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1724F 10744 bytes