Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafd990f8ff8f8f5…

MALICIOUS

PDF

130.3 KB Created: 2021-07-03 16:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9e974cc5d23a4115384e373fd9244f13 SHA-1: ca7d23d06aedeb32a43cda60b0aee8341f6b36da SHA-256: fafd990f8ff8f8f51dee42dbf416afa6bdc68929987eeb7fd932608e6fc2e2ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d450f8503c---83383574054.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/90ca38d1330329cc5051290e4ed71318/36968381732.pdfIn PDF document text
    • http://medrea.ru/upload/files/30426914849.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5eca28f3c---nukuziridelu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf13421c5a---lavukisuborovikelapi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5abac02bf08deedec323e630087672a4/malotix.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tgs40kdgj56b7q5u178sf84j67/toguduzidekeligome.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60658b11c---watasewoxus.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zosalemonen.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3dth8jk21mogc703hief4gcual/sibibajipaga.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6623fmdfv7r36fe960h1md6rmp/59439634890.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/01fd1rbnigp2p7arso9avjh0o4/jegidilu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bef879aa6---fegurubemobobexi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/6490414687.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5afbe400dee5b45013edf52cdb544fe/kobagatutaxab.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dj753oipbpfj61g14o7q9j2or4/muperinopaku.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e4ab95aa---wufapijaditu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3ee4b1311b7e817e11f81ed9e1d3093c/69424442253.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160781b8dcad0f---91754579784.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609217f1cf030---50808482615.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/56579659667.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/915f076fc1782064643aa1e268724024/rirurivikopinexopir.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fde27509---sozasigunozirefol.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/13040619167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=play+pokemon+heartgold+on+iphonePDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001887a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887A 10880 bytes
SHA-256: bf8711faeb9c506ea141b96feb3ce9b076a3257060c3ef2055d969e9fca565c0
font_01_sfnt_off0001a130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A130 20884 bytes
SHA-256: 468668c99e2848554ab18d61ab81fe57669f32eb9b122d2e9d2faa180c28e916
font_02_sfnt_off0001d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D556 3368 bytes
SHA-256: 033a1ad73f7127fa4b1142db8d59fae2c45082c2bf157f7bbf9c4332207ef27f
font_03_sfnt_off0001e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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