Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ad2e18cfea16ed…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 04:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc085125de84988650d80e0194ded9a2 SHA-1: bee9cb3fddce387b3f1ca55c568c51332b2394e5 SHA-256: 21ad2e18cfea16ed606c2c53ff4ef4bfb088ced477e33692d06a9062110b2845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://travelsi.ru/ckfinder/userfiles/files/2782960636.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607483febb895---62652717182.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954e3b238c1---barivalupunosi.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/luvirinemowagupifamepime.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6df8c9b3---19228462408.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/pifemulup.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/pizonikozudo.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/zosekaxapukukoge.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vedamuzatosinipenarawixul.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cc8ab898---vabumabapegamakez.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/86075936065.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a555d772226b9b156e85da5c36681000/29203553699.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/90750680514.pdfIn PDF document text
    • http://drironcat.com/images/file/28859363067.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8c9a0b10a24705cce0cca936cf5eac15/66469117240.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/5674895988.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vobos.pdfIn PDF document text
    • http://zubrcup.by/files/files/44322125561.pdfIn PDF document text
    • http://tai-group.com/upload/files/noxaxifafifuvawewawi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/62501960951.pdfIn PDF document text
    • http://immopolignano.lu/images/27067059981.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2e7016ca31463fb7e99378ca2ea3784d/78311438025.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8420484d92f989ff44a06971f00363f4/63637535147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+a+baby+unicornPDF 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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16996 bytes
SHA-256: da39e8d928052a9cfb25337c5e2dbf5bfbdea655d17f315d8331581b125d4a44
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 10448 bytes
SHA-256: 38d2cc06eaa63446b99ca87511c4ca8313ab1cbbddfc0ae42691a560f3141802
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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