Malicious PDF — malware analysis report

Static analysis result for SHA-256 9739888cc7634e63…

MALICIOUS

PDF

90.1 KB Created: 2021-10-04 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b832c8b2ba8ed551056363a72c18dcc SHA-1: a70dc79e708e2d670057799380057bc8b4a162f9 SHA-256: 9739888cc7634e63747aad9a54da2d6b320dd4847605d6f780de8376ba2683a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://inwebjor.ru/uplcv?utm_term=direction+of+north+east+south+west PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbe91303e8---68313757627.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/laradegamu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/temuvedulegojisibejoma.pdfIn PDF document text
    • http://newshop.jp/archive/file/54610377505.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/nobiwafokuwunawaxunukuwov.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/guponugex.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/31515639622.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xulabupikujelareker.pdfIn PDF document text
    • https://airbays.com/userfiles/file/66015033963.pdfIn PDF document text
    • http://fulico.com/v15/Upload/file/20219231253255049.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/pozetoga.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/83476593295.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/54022237786.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/62851494418.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/toxikapazosubulijanevaji.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1bf0dc2d5c9e54eb2318a2abc03820d7/55703980885.pdfIn PDF document text
    • https://csodamalom.hu/files/files/98922333142.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/73396070179.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092502090934.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/mozulujoruwovu.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/98513308852.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/51811111873.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/ragoxubaf.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5f62b8610---18728943439.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/wuzaluzitejemagedirujida.pdfIn PDF document text
    • 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_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 19536 bytes
SHA-256: f4f2187110045e1f9f69d1fe8fd53207bb05dc036548f8e152b6f30c9224b914
font_02_sfnt_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 10576 bytes
SHA-256: 099b5b7b6d984f0abd1a1695573da626e3025243d9c40b9a3f43da61a8294293