Malicious PDF — malware analysis report

Static analysis result for SHA-256 539a5c5c65949ab1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 09:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d09eec4b31f0fe25f443e21de69ade6 SHA-1: eeaaf64bae338ba842b75c3dc3c799a2eee76eec SHA-256: 539a5c5c65949ab19fb50e3f33f36cdc917a7771bdd9c3edfd049d1103fd1b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. The document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=kulti+mariana+zapata+read+online PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161503d4968341---joxojalejurakamakigitu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613368970438b---88227327233.pdfIn PDF document text
    • http://pk.mo/userfiles/file/27970705447.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/722120044f98c3c5a77eb7f5c61fb8b7/gudovopomonewewiwazipumev.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/sibimoxakomejufu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/96540707932.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/71889714660.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/gugipujiko.pdfIn PDF document text
    • http://konberdbio.com/upload/files/laxuxapopudi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/sobefafa.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zemejokir.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d7a9e9472ff907e00b1199d9ab5c1859/genamov.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/36818343796.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59988261469.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77513539334.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/tijeliwixowedazigugokuw.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/37198541913.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/35345905147.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/zowugemavotivadali.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e75b4e44ba---jezewolumokarogeb.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/40399001184.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/77776804346.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/40215314214.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/xijeboketedamifafaxago.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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 15648 bytes
SHA-256: d4b86b367e375a51e6572dbe6789574d34ac7c106773509b2144432d043295f8
font_02_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10536 bytes
SHA-256: faf625873393693a5aff5a2a096121e502861c1733310dbad4856aaad30b8a09