Malicious PDF — malware analysis report

Static analysis result for SHA-256 87681fdc14dd807e…

MALICIOUS

PDF

94.2 KB Created: 2021-07-05 15:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0768feeb5f38708647234e7b3d8c0d1d SHA-1: a4f0bf8edf4786e3060c277762a50c561619ae2b SHA-256: 87681fdc14dd807e4937d2b00e364cf9b469f4c4c8e020245d70d68afd9a003f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing or malware payloads. The presence of external URIs and link farm heuristics strongly suggests an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/70671617433.pdf In PDF document text
    • http://bsbcarpet.com/userfiles/file/fupapaxosumebitiwuxomag.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d3g4prn7j198lu1p9rj2jba223/rufisewigomarugukomedimat.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2501be1a631327c3ac9068c3bf25a690/59788389228.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ee00eb798---72949354742.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/70511569752.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829dc936f3c---demamasetafekitigeju.pdfIn PDF document text
    • http://livestocktool.com/d/files/tibepegimajarakom.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/gujetaxufanarupipupami.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/38169978810.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f8a61c7f074488b5cd79c18896c24b36/51396332378.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6d0c93da---53630959180.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc1962e82c---zelerozemet.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df28155214---zurezivovuwepit.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/notadiwovomigoz.pdfIn PDF document text
    • https://daismene.it/file/79213812097.pdfIn PDF document text
    • http://fkhd.cz/data/img/xujeweligegelojuwibo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2aa6738fd39179ee7905325159f224f/denenesajomitax.pdfIn PDF document text
    • https://stopserv.ru/files/file/rilemajakikifese.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/fudukesafemogolu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c4687770---7598206882.pdfIn PDF document text
    • https://caffedisanto.it/file/90698534981.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d0d365654d9254258f01db154dc35c65/lodepugelavelobejamegopuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stalin+malhotra+physics+class+10+solutions+pdf+downloadPDF 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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 18412 bytes
SHA-256: ed13736719d774e44484d8327b6f8f868d323bac07724f2630715915faa978f8
font_01_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
font_02_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 11304 bytes
SHA-256: 44053b4364fe4442115e50c4728a31316ef7573f08d896fa1fdc44fc68dd426c
font_03_sfnt_off00015271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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