Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caff0bbf4514c93…

MALICIOUS

PDF

92.7 KB Created: 2021-09-06 09:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6508fd89775e656284b0ea35f833c4e4 SHA-1: b82747accff6795efc21b4834d6af2bece1c06aa SHA-256: 0caff0bbf4514c9307d1f4b66f00f4b2d5405fb8aaacc3dc14f36210ece50b05
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised Content Management System (CMS) upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, often associated with SEO poisoning or phishing campaigns. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=harlequin+euphonium+solo+pdf PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/sufibig.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/75141804506.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607621de747f3---zuguvozurupamupuzekigag.pdfIn PDF document text
    • http://turatabor.hu/media/61033759426.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/golopunafefunuvol.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3895704ee9---xisumulatulifira.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/ginalomegimozix.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/49854246954.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/69843174816.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/79131454889.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pubuga.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/980a28f17d10de3e297085552504f040/13103057608.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611026984d188---61397639304.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/pinajubupasule.pdfIn PDF document text
    • https://latework.cz/soubory/8736048441.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/98155955556.pdfIn PDF document text
    • http://edgecs.net/documents/mutuso.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/tikewavagakuzonuradub.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160989b55c9782---87112334872.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bj4843pgmitg1n21hlmlbc8o5u/jimovud.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ec8fa5044---75707748099.pdfIn PDF document text
    • http://foxadv.net/file/53703587355.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rolapisuxuborefenazopa.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_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 19500 bytes
SHA-256: 9e9f9b61bc89d2d0c5a06d6b4f3b02fb64a2784fd184012c81953ffeb8a223b3
font_02_sfnt_off00014c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 10904 bytes
SHA-256: f94b34f0332b6a29dbe23cdf69b76a439c15d0045b731ed52343ed2a000d13e0

Open this report in the interactive analyzer, or submit your own file for analysis.