Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a18245573baeb45…

MALICIOUS

PDF

79.8 KB Created: 2021-08-26 02:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdaa7628e0dd033b7369053ef42fcc3c SHA-1: 49736200f2aa3150f4f33b89f2cc7fb40767a394 SHA-256: 1a18245573baeb45d81eb47f01ddc4c206866e76d3707d07be9639228a6c59b0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of external URIs and link farm heuristics strongly supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=endless+love+full+movie+download PDF link annotation
    • http://stroisvias.ru/userfiles/file/32190434682.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9cdb08dd---viwobokaxon.pdfIn PDF document text
    • https://everestart.com/images/stories/file/57182788718.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/2293141538.pdfIn PDF document text
    • http://yilip.net/userData/board/file/51447837091.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160cfca249a553---zipobesipirajepuvigigurez.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/985a9a19286e3ffc5a9d544bbd5a64bd/wixobip.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161267371d655b---4676238893.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/sutelidiwimo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fa41440fa28063be2b7525aa1dca32fe/39683699584.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3d9ec948b226682a772d722c364a8fc8/notezurofaka.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/86801039450.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/jelumotaditexexotedosub.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4ue13lkcipsjvq3mumaikv5ok7/xulepep.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4cda6c97ee4fc5817fceb0366df3ed7e/56818477045.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/32636108618.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/zavesugelosemigajani.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/muwosowavopidegudubumip.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/kulogo.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/36284760757.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc303a2682---woberora.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160752b4590873---pemogekenawurud.pdfIn PDF document text
    • http://fructusartis.com/i/File/67327596751.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/97967167727.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pawewanog.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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 10552 bytes
SHA-256: e919caac96d99f52d12f006ba5839db3dfdcb58e4cb41f86961b7381f90c64bb
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 16864 bytes
SHA-256: d7a022f8737db18c93c8a6ac8c59a17980b93adedbd3eea7baccfae06b91ca22
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1