Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eb759e7688484b…

MALICIOUS

PDF

78.4 KB Created: 2021-07-23 03:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e5c4b84f626427d8cb56b8b4dba4e94 SHA-1: 71bbe21d87cea31ad133dcf5c97386f363396556 SHA-256: 11eb759e7688484b8e51abf43020860a3836f734d4ce1b4e8deaa1e4040f9be4
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristic firings indicate the presence of algorithmically generated URLs and link farms pointing to compromised WordPress uploads and disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cupanghitam.com/contents//files/gajivalaleditugizoj.pdf In PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hfuc3rmehgglqb8e9017r99qe3/30280453141.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/savojakejuxevaverupobok.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hcqf263p3vf0ap9umiq31auom0/sepuzuvuwapilavodonako.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a3bd2b3de---losirunagoxukejeniwegav.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b3d1baeff06a755b0058fed886b2c11c/93789243024.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vpsgoeqk1mlbfjamjehng1qkte/jetijulodibidezeselifomu.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/dolojulorujawetiledulik.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6aedb55262f8b4675abfe9af1ab3ef9e/gituxenatefilazo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/h8gvinocaq0muo253kfu22bfbi/23462172181.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ho31007ul9d04v60bil5u143l3/kesipugufowu.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/78790910663.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/ludemotigozabowulop.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/92501636032.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ae72e75e2---406061200.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nurrdghrina4jrsmagotg6dah1/70254437545.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c8bf00d1133afd88840e13c0f669a332/909982356.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833aa0e71d0---wijogi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/i6kcqok5rm13fjgct987n9s4et/novabixulagakogikibofinuk.pdfIn PDF document text
    • http://sam-global.info/files/file/panizikozaboder.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/furemaburodewez.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1i65fqaqrkoah3nrqhdshgo244/janejatabaw.pdfIn PDF document text
    • http://iccarrentals.com/files/file/30564341608.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/nezara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pinewood+middle+campusPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 17200 bytes
SHA-256: 99b67cacd3f13638284938373ad734d7a778faa4056c2221f8ad61da015fe272
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 10664 bytes
SHA-256: 814e4437b74e709a742ed263183ce2c5fed7d0d2cb7f273ea2c42a41027fc789

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