Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8087bdb14d8778d…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 03:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cffdcb60dc333337d2ea0a4c73c49ece SHA-1: 75df109c5551c131603b506d66d1973bdabae4d2 SHA-256: e8087bdb14d8778de288e2ef938e4d33bfbd5415e1cd3c1902e166b9634d3f99
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, where users are lured to click on links that may lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cecev.com/stockages/files/kexujoresorifuf.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/989b480eaf1c1a801f370462412c7392/65098582138.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/48652790700.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20706375f---noxak.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/22bfe305f9a0e48a604128d921b7f3d3/wijitoririkedidajogi.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/gisibasizukupumu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608d46b66f000---vesagamaxaxogak.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029cf3d0ec---33866349465.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/19168232942.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kin28n4hqfg608ag9sne5ro32n/81550557567.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a32147968---filoluritulasegopipedonex.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///93342047104.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3dd113e94fcb424a7f19a21ad5da6b05/34629146009.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/dukolataga.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3c24c3a0---budogewobobemiloj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fb4de5e412373ea3aa08c61506e1fda6/bukeburujo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf81f074ea---takogozumetenisofinemiza.pdfIn PDF document text
    • https://isleo.com/i_photos/file/58714600964.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/b3cd3105uckmblt81gqou2ft30/33266169675.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/eq3ubkua2ihcfl49pe7dfc8712/35517325369.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062305170149.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a2403ce---somukepuduseduru.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3becqqvdffsg0k62p2474v4lu3/20064299993.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/pokaguzujixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=converting+vertex+form+to+standard+formPDF 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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 10848 bytes
SHA-256: 32086fd644d65dd9fe1fd87baa9e7a27fc3fd717f826d5fc455c4321a8565df6
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 17936 bytes
SHA-256: f93b9d1d6ba6401af91f055782bcad51d7fd1663f2af1ffa468ec99acc4c1c6b
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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