Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa9f14b2effa00e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 01:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 140c4d7b8fe3235c553349eba00eb971 SHA-1: 3340f8bffb200e6ee6441c227287186b7699da99 SHA-256: efa9f14b2effa00eb1450b97567ae9e59b5dd0401a03097e3ce8e44ed34f4149
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ri-rm.ru/userfiles/file/16018066402.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/robugimi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/biretarudolomutemimuxo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/puojt46dct7ukadge2agk7neuc/81091063134.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/21422565436.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/09fb8fc3c4c79bf393741bca7faee63c/wugajeguvanaluzit.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/30283869058.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xeviwugazar.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/28298699376.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee2331ea5---fibebalelufezifek.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/dojopulewevu.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/50678994827.pdfIn PDF document text
    • https://educhina.mn/editor/files/23657626740.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607877a9f3f2c---zepase.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/rukenawubamaxopaginegu.pdfIn PDF document text
    • https://tepihtrava.rs/files/3433608490.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da047dbed44---tizejobawoxi.pdfIn PDF document text
    • http://toonesk.com/upload/vilezozoreramixejiku.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/49328210783.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/rebinominuwidibolu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/49ccfd7ba2c1a0d197c66c2166d1d97d/goxanofufuze.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/90036046162.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/65509199270.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c0d85c3bf8f70c56c9d8e1c3035a4e59/xizifutibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=spectra+s1+pdfPDF 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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10376 bytes
SHA-256: 71288e5a4fd6c9df49a95ec555dd00f6ba1a86e1cfb708559f4bda0fa499f488
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 18012 bytes
SHA-256: 0d180342bb110bb58919d42d9c4b76e4da03b0fcb82391088d0574fd74346b8f

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