Malicious PDF — malware analysis report

Static analysis result for SHA-256 141fdacb7bac7f5f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 11:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79e462379476a25980de6e7cd5ece3fc SHA-1: 8972f3c8ff05dbed79bcb161ab1c405a2f6e0a30 SHA-256: 141fdacb7bac7f5f1b58c70db636527ec48f28680383b63773a79975b836e10c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://esterkins.de/ckfinder/userfiles/files/womozelirikul.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/08v4sh253tn11skcm7mgo5cc2g/dexanapijefirunen.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a8cd60778---39682823150.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd3ea906e---dotimodawugagopuze.pdfIn PDF document text
    • https://nexusmediation.nl/files/ketoniwanoza.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b49303161ad3b6897ce8cff479316f50/92857943976.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/86324500902.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/56743963011.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/gungsencd01m2qvd9kv76q5dge/71829818717.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/tudobekutaroso.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dfb7b677---47574119024.pdfIn PDF document text
    • https://123natura.com/stockages/files/jurakigekamid.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/63640910799.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/18c371b9be063b629a7fe0a8502a5a1e/bodusiruxasowaxilupesef.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d07401e5e---78335807870.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/xuwazupulonemivenejekok.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0f20e384---dojanixifesokulogimik.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/tinuvefak.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/21991856004.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/35843774727.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/veguzuxopuxadokevexuko.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/xajobolozubunuk.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xufenilapazabavul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=visor+pdf+online+para+imprimirPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 18172 bytes
SHA-256: 8f5eef2ed33508882453ef1c561618b036b377f37e235dcc6ddf14209365a2f3
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 10528 bytes
SHA-256: dc778f20193d025f6274c8e9a483f5d955d4c3c82daee5da326172bad1e3a009

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